A MECHANIC WHO HAD DEFERRED; OPENED AND COLLARED THE CIRCUIT BREAKER; PLACARDED AND LOCKED THE FIRST CLASS #2 OVEN IN THE CLOSED POSITION; NOTICED THE SAME B767-300 ON A RETURN FLT; WITH PLACARD TORN OFF; CIRCUIT BREAKER CLOSED AND OVEN OPERATING.

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ON JUN/XA/08; MYSELF AND AMT #2 PLACARDED THE FIRST CLASS OVEN INOP FOR A BROKEN OPERATING HANDLE. PER THE GALLEY ITEM AND SAFETY OF THE ACFT; WE OPENED AND COLLARED THE CIRCUIT BREAKER AND LOCKED THE OVEN IN THE CLOSED POS AND APPLIED INOP STICKERS. THE FOLLOWING DAY AT APPROX XA00 ON JUN/XB/08 WE WERE ACCOMPLISHING THE INTERIOR INSPECTION PER THE ETOPS PROGRAM AND FOUND OVENS WERE IN OPERATING CONDITION; BUT WITH 'INOP' PLACARDS TORN OFF; OVEN HOT; CIRCUIT BREAKER CLOSED; AND BROKEN HANDLE THROWN ON TOP OF GALLEY CABINET. ON JUN/XA/08 WHILE EXITING ACFT; AN ANGRY QUESTION WAS POSED TO US AS TO WHY THE OVEN WAS INOP'ED BY A FLT ATTENDANT. I TOLD HER THE HANDLE WAS BROKEN AND THE OVEN SHOULD NOT BE OPERATED BECAUSE IT COULD OVERHEAT. THIS IS A CLEAR VIOLATION OF THE PLACARD WITH TOTAL DISREGARD TO THE SAFETY OF THE CREW AND PAX. ON JUN/XB/08 WE WERE THE FIRST PEOPLE ON THE ACFT AFTER THE PAX AND FLT CREW DEPLANED FROM INBOUND TRIP. RETRAIN FLT ATTENDANTS TO NOT IGNORE PLACARDS FOR SAFETY REASONS. FLT CREW IGNORED WARNINGS; BYPASSED DEFERRAL AND OPENED CIRCUIT BREAKER TO OPERATE OVEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED ONLY ONE OF THE TWO FIRST CLASS OVENS WAS PLACARDED INOP. HE WAS CONCERNED THAT WHOEVER TORE OFF THE 'INOP' PLACARD AND PUSHED THE CIRCUIT BREAKER BACK IN; TO OPERATE THE DEFERRED OVEN; DID NOT REALIZE THE SAFETY ISSUE WITH THE OVEN DOOR HANDLE BROKEN. REPORTER ALSO STATED HE HAS NOTICED WHAT APPEARS TO BE AN INCREASING DISREGARD FOR CABIN ITEMS THAT HAVE BEEN PLACARDED AND DEFERRED INOP BY MAINT; ONLY TO SEE THESE CABIN ITEMS STILL BEING USED; SUCH AS LAVS; OVENS; AND SPARKING CABIN INFLIGHT ENTERTAINMENT SYSTEMS. ALTHOUGH THESE ITEMS MAY NOT BE NECESSARILY CRITICAL FOR ACFT PERFORMANCE; USING AND RESETTING CIRCUIT BREAKERS DOES CONSTITUTE A SAFETY ISSUE FOR CREW AND PASSENGERS. OVERHEATING AND ELECTRICAL FIRES ARE POSSIBLE RESULTS OF THIS TYPE OF BEHAVIOR.