On the mounting bracket for the wiring harness(on the transmission), the harness had been "twisted" in such a manner that it had begun rubbing against the side of the transmission as it went to the solenoids. I repaired the rub spots, straightened the wires and resecured them, then replaced the selector switch. After 1/2 hour of no problems I returned it to the operator and waited another 1/2 hour, I have not had to go back yet.
On another unit at the same plant, I had 1 that was moving only a few feet then stopping and giving a low pressure warning, I verified with a manual guage(best for transmission work as you can watch for needle bounce if you have a clutch pack problem), I was getting only 8-11 psi of lube pressure, VOLVO warranted the unit and that was the resolution to the problem on that unit.
