Glad it worked out for you. I agree with one of the comments on the first page; it should have been obvious in the braking mechanism if the brake had been left on during use. Had this not worked out, I'd have recommended making them open the saw and show some kind of evidence to back up what they were saying.
Definitely more than a bad clutch if truly unfixable.
Definitely more than a bad clutch if truly unfixable.