This AEG vacuum cleaner is also sold under the brand Electrolux.
A disconnection close to the schuko mains plug in the cable resulted in too fast powering and de-powering of the vacuum cleaner, which resulted in blowing up the triac (depicted above). The BTB16-600B TO-220 triac can be bought for about 0.17 Euro.
Repair: replace schuko mains plug and replace BTB16-600B triac