TO DRAIN THE CAPACITORS:
Do at your own risk
Take a screw driver.. with a plastic handle. wrap a wire.. anti static wire would work. make sure it has contact on the front of the screw driver, then plug it into the grounder int eh wall, the botom prong. then tap each capacitor.. this will discharge it
after doing so, take out the fan, some may require snipping, if you want to try to repair it, grab some wd-40 or some other mechanical oil, and spray it into the back of the fan. To do this you need to take off the sticker and expose its innards. after spraying, spin it to get the oil in , put it back in, may require soldering, if wires were snipped , or if you have an atachment.. attach it back put cover back on and go

if you wish to replace fan, just do the smae thing