What was found
FLT ATTENDANTTS REPORTED AFT GALLEY OVEN 4 13 (BIG OVEN) BEGAN SMOKING APPROX 2 MINS AFTER APPLYING POWER. TURNED OVEN OFF. OVEN DOOR CONTINUED TO GET HOTTER. SMELL OF ELECTRICAL WIRES. SMOKE COMING OUT OF VENTS ABOVE OVEN. COULD NOT PULL CB'S IN AFT GALLEY. SECURED POWER VIA FLT DECK GALLEY POWER SWITCH. OVEN DOOR CONTINUED TO GET HOTTER. ACCOMPLISHED QRH FOR SMOKE/FUMES IN CABIN. DIVERTED TO YVR. F/A'S WERE ABLE TO PULL AFT GALLEY C/B'S AFTER FLT. DECK GALLEY POWER SWITCH WAS TURNED OFF. ACCOMP GVI ON AFT GALLEY NR 1 OVEN C/B 1 PER MM 20 60 01. ALL CHECK NORMAL. REPLACED AFT GALLEY OVEN 4 13 PER MM 25 32 01 PB 401. OPS CHECK GOOD. C/B AFT GALLEY NR 1 OVEN RESET.