I have a mini-itx Gigabyte 1070 which has a bad fan, it only starts if I push it by hand, and at some point it stops for some reason, I've never been around when it stops.

I tried pulling the rottary part off, cleaning and oiling up the middle pin, and it didn't make a difference (it wasn't very dirty to begin with).

Right now I have another fan working on top of it, but I didn't dismantle the shroud, and it's fine, but it's winter time and I'm keeping the mining PC on the balcony.

Do you guys have any suggestion on how to fix this fan? as I will probably want to eventually sell this card.