True @gr5 but if it's the transistor of the mainboard fan pwm there's always a chance that just works but 'weird'.
Check the fan control con the Ulticontroller/Control/Temperature/Fan and set it to 255 like gr5 said. Does it spin fully?
Change fan speed to 1. Does it spin faster at 10 than at 255? (255=100%)
So please check how fast it works at 255 and at 1. If it moves faster at 255 than at 10 then there's nothing wrong with it, also make a video of what's happening, that always helps.
Is the fan set to 255 on the ulticontroller? (you can play with fan speeds while printing). not 100. 255. That's all I can think of. Otherwise maybe defective fan? I guess the PCB could be partly broken but usually it fails all off or full on.
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