Everyone, I know that this is an old thread, but I just had this issue 7/31/2012. So, I am contributing to the forum to help others. Well, like most people my blower only worked on high. All the equipment is original (1993). After reading the thread and thumbing through my Service Manual, I decided to head to the junkyard and pick up two of these Power Transistors. Both worked, and I am operational again, allowing the blower to operate at low speed, and incrementally up to the maximum speed. I took some pictures and posted them for others to benefit. BTW, the junk yard price was $25 each (with a warranty), OEM price lists for $182, and be purchased as low as $130. OEM part number for the Power Transistor is: 79330-SP0-003. I hope this helps someone.
Linear Mode
