I have a 17,RT SE6, about 3 months ago, park brake wouldn’t release, unhooked rear linkage, got it home, and it started working. Hooked it back up, all was well. Until yesterday, wouldn’t unlock, unhooked linkage, got it home, still wouldn’t work. Took switch cluster out, unplugged park brake switch, cleaned it, put electric grease back on it, worked great, put it back together, still worked great, went inside, had a sandwich, went to put in garage, wouldn’t unlock again. It’s still under warranty, too it to fixit shop, they said warranty probably wouldn’t cover it cause it was a brake problem. I explained that it was a park brake problem, not brake problem. He said they’d check it out and see. I’m thinking switch or motor, any other thoughts ? Thanks