I set up my Duet 2 Maestro board on an A8 body and managed to get the fan polarity wrong and can't seem to fix it.

It's the print cooling fan that won't work. I've replaced that fan, and it works on the 'always on' fan output, but not on FAN0 (or any of the others, but I'd already tried them before I realised my polarity error - I had assumed this wouldn't cause damage, just make the fan spin backwards or something)

I've seen that TR5 controls this fan, and whilst it didn't look damaged, I replaced it as best I could - very fiddly given the size. I have no idea if I damaged the replacement with excess heat putting it in but assuming I didn't, is there anything else I could check that might be the problem?

I've verified that I've set the fan voltage to Vin (12V) and that I have a 12V fan