Anyone actually have the blower power transistor be the cause of blower running on high only? I see where the service bulletin for this suggests 91's and 92's up to 000697 can have a problem with this transistor causing the blower on high only--just like the circuit board. I had the circuit board go bad 5 months ago and sent it to Langguth for repair. The system worked fine until yesterday. A local friend with a spare board let me try it today, and still only runs on high--so now I think it may be the power transistor--but my car is just outside the range for the service bulletin and the part is >$200--I'd hate to buy one and have it not be the problem. Just wondered if anyone ever had the transistor be the cause, and if anyone ever bought one and did not need it??