I did some looking through the same I have and thing I have made some progress.
This info comes right out service manual
Shutdown from an overvoltage or over current condition is preformed in the SMPS. When there is an overvoltage condition in the chassis, a High singal is applied to the base Error Latch transistor, Q494, from the overvoltage sensing circuit. When Q494 is turned On, grounding the 7.1Vdc bus, which removes the source voltage for Q470. an overcurrent condition will will create a negative singal at pin8 of T48, which will forward bias, the overcurrent Sensing Diod D465. This negative signal will be applied to emitter of Q494, turning it on, shutting the chassis down. The chassis will try to start and run again as as error causing the condition goes away. This can produce a sound of "ticking" from the chassis.
That is exactly what my seat is doing when the seat is first powered on after that seat runs fine with no trouble. Know I got find what could be causing the porblem it's eather overcurrent, overvoltage, or the SMPS has a part that is failing. At this time I can't test for high voltage as a currently don't have a high voltage porb.
Here is link to service manual. I will remove it if any has porblem with being posted here
https://drive.google.com/file/d/14kw...w?usp=drivesdk