What was found
(CAN) 20 MINS.,INTO FLT, CSM ADVISED CAPTAIN THAT STRONG ELECT. SMELL & SMOKE IN AFT GALLEY AREA. FLT CREW ADVISED ATC OF SMOKE IN CABIN & REQ IMMEDIATE RETURN TO VANCOUVER. FLT CREW TURNED GALLEY POWER OFF, AND CSM ADVISED THAT SMOKE HAD CEASED & SMELL HAD DECREASED IN INTENSITY. ATC ADVISED THAT SITUATION UNDER CONTROL. OVERWT LDG COMPLETED. AFTER LDG CREW ENSURED THAT NO INCREASING SMOKE OR ODOUR IN CABIN AND THEN TAXIED TO GATE. MAINT DISCOVERED NR 3 AFT COFFEEMAKER HAD BURNED WIRING &T HAT LOW WATER SENSOR HAD EXITED FROM TOP OF BOILER. COFFEEMAKER REMOVED FROM A/C & RETURNED.