Another follow up;
I spent most of the morning trying to get the TC to fail so we could test the theory about the hydro fluid temps. Could not get it to fail...
I finally gave up and the driver of that unit picked it up, completely warmed it up, and "it" promptly failed about 3 miles from the shop. I guess our previous deductions didn't hold much water....
I'm thinking that if I can get through the next series of storms, I'll pull the CPU's out of another unit and swap them and see if the problem follows the CPU's. If it does not, then I know it not the CPU's.
I'm about desperate enought to just pay the $1,300 (plus Tax & shipping) for the drive & console CPU's and hope and pray that solves the problem. If that does not resolve the issue I guess I could just keep them as reserve parts...?
Tim