A B767 WAS RETURNED TO SVC WITH A #2 ENG OIL LEAK THAT REQUIRED AN ENG CHANGE TO CORRECT. RPT WAS SIGNED OFF ILLEGALLY BY A SUPVR USING AN UNAUTH SIGNATURE AND EMPLOYEE NUMBER.

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ON THE NIGHT OF NOV/XA/98; MY CREW WORKED ACFT FOR AN OIL LEAK #2 ENG. THE MECH THAT TROUBLESHOT THE PROB WAS AZZY. THE R ENG HAD A WRITE-UP FOR OIL LEAKING FROM THE COMPRESSOR REAR FRAME OIL SCAVENGE B SUMP FITTING CALLING FOR THE GASKET TO BE REPLACED. THIS WAS NOT THE PROB. THE PROB WAS MUCH DEEPER THAN FIRST THOUGHT. WE GOT TECHNICAL SVCS INVOLVED. TOLD THEM WHAT WE FOUND XYZ. HE SAID THAT WE HAD AN ENG CHANGE IN AREA OF THE LEAK WITH OIL IN THE TAILPIPE POINTING TO THE RECOUP DUCT. BUT HE WANTED TO DISCUSS WITH AN ENGINEER; BBB QQQ. BBB QQQ SAID WE HAD AN ENG CHANGE. THE SUPVR YYXX WAS AWARE AT ALL TIMES WHAT WAS GOING ON. YYXX KNEW WE HAD TO FERRY TO ABC FOR ENG CHANGE. AT AROUND XA30 I MADE A LOGBOOK MAINT ENTRY STATING THAT THE ENG HAD TO BE CHANGED. WHEN MR. X AND I LEFT WORK THAT MORNING THE ORIGINAL WRITE-UP AND THE ENG CHANGE ENTRIES WERE STILL OPEN WITH THE SUPVR; TECHNICAL SVCS; ENGINEER AND MGMNT (MXMX) UNDER THE UNDERSTANDING THE ENG WOULD BE CHANGED. THIS DID NOT HAPPEN. YYXX SIGNED OFF THE ORIGINAL WRITE-UP USING AZZY NAME AND EMPLOYEE NUMBER AND MXMX SIGNED THE ENG CHANGE ITEM. AZZY WAS NEVER AWARE THAT YYXX WAS GOING TO DO SOMETHING LIKE THIS. THE ACFT HAD ONE MORE LOGBOOK ENTRY REGARDING AN OIL LEAK #2 BEFORE IT EVEN LEFT ZZZ. THIS ENG SHOULD HAVE BEEN CHANGED AND SUPERVISION SHOULD HAVE NEVER USED AN EMPLOYEE'S NAME AND NUMBER UNDER FALSE PRETENSES.