[Aredubjay]

Popps,
Sounds like you're going down the same road I did. Rebuild, then, six months later, flare. They replaced the TPS (I paid for it, but they didn't charge for labor). About six months later, 2-3 flare again. 31 Days later, after changing solenoids, checking resistor, etc, etc, they dropped it and rebuilt the high clutch. Less than six months later, I start getting duty Solenoid C codes and my AWD locks into 50/50. I'm reluctant to take it back in, for fear of waiting another thirty days for diagnosis.

Beav recommended I try substituting another control unit. I did. I now have a permenant replacement and the car's running like new. So, if problems continue, try finding a used TCU. It may be your problem.