My friend’s RSX blower wasn’t working so he brought it by for me to help him debug it. The fuses appeared good and once in a while it would start up for a few seconds. Searching youtube, I found the following video which points to the culprit as a thermal cutoff.
The video links to this webpage with instructions on replacing the thermal fuse in the power transistor module.
Measuring the resistance across the fuse indicated it had opened. Checking the cabin filters, they were very dirty and would have caused the overheating in the module with the airflow restricted. The service manual recommends replacing the cabin filters every 2 years or 48000km.
The part number for the module is 79330S6M941 and it can be found on ebay for around $15 USD.
The Digikey part referenced in the link to replace the thermal fuse is obsolete and no longer available. Digikey part 317-1134-ND appears to be a close substitute and available if you want to just replace the thermal fuse. The leads are a bit thicker and won’t fit through the old holes so you need to bend it inside the pcb to make contact with the top of the circuit board.