I've been all through mine and they are pretty simple, differential vacuum system. More than likely, one of the boots (actuators) is torn in the wing or needs to be resealed with electrical tape of all things. Could be a couple of other things as well like the TC, vacuum hoses, poly lines, pilot valve.I have a freshly rebuilt pilot valve it it turns out to be that and also have the poly line and connectors which are readily available through a Parker dealer. Just don't tell them it's for an airplane.
Where is the gyro located for the TC? On the TC or remote?