What was found
F/A REPORTED WHITE SMOKE COMING FROM NR 4 OVEN IN AFT GALLEY. TURNED OVEN OFF, CLOSED DOOR. SMOKE STOPPED. PULLED C/B FOR OVEN NR 4 INSPECTION SHOWED HEAVY GREASE ON OVEN RACKS. FOUND CAUSE OF SMOKE TO BE AN ADHESIVE LABEL ON A FOOD RACK. CATERING SERVICE REMOVED ALL RACKS FROM A/C. OVEN OPERATES NORMALLY AND IS OK FOR SERVICE.