Aux Air Valve Repair?

I wonder if one of the two AAVs is stuck open on my car. The car idles perfectly when cold, but has a lumpy idle when warm. I have eliminated ignition components and any obvious air leaks.

To my understanding, AAVs contain a bimetallic strip to which a current is applied when the engine is turned on. When the car is cold, voltage is applied to the strip; in a few minutes it closes and pinches off the extra air. It remains closed by engine heat when the car is up to temperature.

As the issue arises when my car is up to full operating temperature, I expect the issue is the mechanical operation of the valve, not the 12v power applied to it. I will confirm that the valve remains open when hot, but as a new one is $3400, are they generally fixable?

 

Thanks - will check the voltage this evening. I suspect that having one bank having an open AAV while the other is closed would lead to the lumpy idle it has when hot. Car is a 92 Diablo, so mixtures are not really adjustable. Cap, rotor, wires and plugs are new. Injector cleaner and some driving has helped a bit, but it should be really smooth at idle.