You mentioned that replacing the mount fixed the problem the first time. You suggested that perhaps the reason it failed was because of a bad oil leak. It seems reasonable to conclude that the carrier bearing bushing may very well be faulty as a result of the leak. If it really does look suspect, it might be prudent to replace it, as you may need a new one anyway. The carrier bearing bushing failed on one of my friend's cars, and it was certainly very noticeable. It took a few guesses before we figured out what was happening. Carrier bearings just aren't one of those parts you normally expect to go bad.
Still, I think you're probably on the right track regarding solenoid C.
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