What was found
AFT FLIGHT ATTENDANT REPORTED STARTING TO SMELL A BURNING ODOR DURING FINAL APPROACH COMING FROM LAVATORY. DESCRIBED IT AS SIMILAR TO OIL BURNING AND SAID IT DID NOT SMELL LIKE VAPING OR CIGARETTE SMOKE. SMOKE DETECTOR DID NOT ACTIVATE. UPON REACHING GATE, HE OPENED THE LAV DOOR AND SAW SOME WHITISH VAPOR NEAR CEILING, WHICH RAPIDLY DISSIPATED. NOTHING WAS FOUND IN THE TRASH RECEPTACLE AND NO OBVIOUS SOURCE. (FLIGHT 3651)