Nissan Rogue 2016 - Intake Manifold Discontinued?

My father in law called me this week asking for some help with his 2016 Nissan Rogue.  He started noting problems climbing hills, the car would be down on power and lose speed.  Eventually this got worse and any major request for power was met with a slowly accelerating CUV.  I feared the worst and assumed the CVT was starting to go out with just under 100k miles, but he had taken it to the dealer where they diagnosed it with a failed intake manifold.  This Nissan 2.5L has flaps in the intake manifold for what I assume is variable runner length control or something similar, and I assume these are no longer functioning.  The trouble code wasn't given, but I assume it is P2004 Intake Manifold Runner Control Stuck Open based on some other search results.  The problem is, after waiting a few months for a new intake manifold to arrive the part is on eternal backorder and is now marked as discontinued.  As far as I can tell, it is specific to certain year model Rogues and is not shared with the Altima.  There is no aftermarket part that I can find.  I'm curious if anyone here knows more about the issue and what he might be able to do to solve it.  I would do some work on the car for him, but it is located a few hundred miles away and he isn't great at being a mechanic so I can't guide him much over the phone.

Intake Manifold - Nissan 14001-4BA0B Manifold Assy-Intake

The link shows a six year model run, would a junkyard be a good option?

There's a TSB to replace the valve it frequently doesn't work the root of the problem is sticky valves themselves. No aftermarket, national backorder I currently have customers waiting the better part of 8 months for one, presumably this means a redesign that addresses the issue but no official word yet. 

Can it be disassembled and cleaned?  Or flush it out with MEK or something if its just gunked up.  

Otherwise best suggestion I have is to call the local dealers and see if there are any in the warehouse.  Failing that set up an alert on Ebay and Amazon to see if one gets listed thats new old stock.  

That sucks.  Nissan has been using this paired with the 2.5 since the 2.5 was first released.  Any chance it can be backdated? (just make sure the screws have loctite!)

Also I am curious... exactly HOW down on power would a sticking variable runner be?  Is it stuck halfway open?  I'm no an expert on intake manifolds but it seems like even if your runner length is very wrong, you would still be able to make respectable power - enough that the average appliance operator wouldn't notice.  

Try cleaning the o2 sensor. I have a friend who had trouble with hers. Like 4 shops told her it was the cvt going bad. Finally someone tried cleaning the MAF and the issue went away for a day or two. Bogglesy mind because I've never actually seen the MAF be the real problem before this.

New MAF has resolved her issue. 

I don't know if she had similar issues with the intake actuator, but I know the car wouldn't accelerate at all which is why everyone blamed the cvt.

I feel the back order pain. And the discontinuation. Sometimes the big manufacturers do odd things. Toyota stopped selling axle bearings for 1st gen tacomas. Dafuq? 
Im not a Nissan fan, but I know the rogues are well liked and generally pretty good. 

Robbie (Forum Supporter) said:

Try cleaning the o2 sensor. I have a friend who had trouble with hers. Like 4 shops told her it was the cvt going bad. Finally someone tried cleaning the MAF and the issue went away for a day or two. Bogglesy mind because I've never actually seen the MAF be the real problem before this.

New MAF has resolved her issue. 

I don't know if she had similar issues with the intake actuator, but I know the car wouldn't accelerate at all which is why everyone blamed the cvt.

Related note, I did have problems similar to the above with the 2.5 Sentra SER before, and yes the MAF was the culprit.

Have you tried moving the flaps manually to see if they are free? 
 

If they move freely and theres no codes, I'd start checking the items suggested as well as checking live data in O2 sensors, cat temp, and look for possible cat starting to clog up restricting exhaust flow and limiting power.