Well, you need to lift the drive out of its plinth, then follow the power cable into a little black box, which contains a little pcb that has also got the main switch on it. On that pcb you should see three caps - two of these (C2 and C3, which should be 0.33 µF and 0.68 nF, both 250 V types) are the phase shifter caps, which usually are responsible for your problem. But it wouldn't be a bad idea to also swap C1 (10 nF, 250 V - and at least X2 safety class!), which is the anti-sparking cap for the main switch, because these usually die sooner or later anyway (and often do that with quite a bang, leaving a rather nasty stench...).
Greetings from Munich!
Manfred / lini
P.S.: C3 may be missing in some exemplars - basically it's only intended for 60 instead of 50 Hz operation, but nevertheless doesn't seem to disturb the latter...