What was found
LAV SMOKE EICAS WARNING APPEARED IN FLIGHT FOR ABOUT 20 SECONDS. FA REPORTED SEEING A VAPOR/FOG FOR A FEW SECONDS AFTER OPENING AFT LAV AND DETECTED FAINT SMELL OF SMOKE/FUME AS THEY APPROACHED VAPOR. SMELL AND WARNING DISAPPEARED SHORTLY AFTER OPENING AFT LAV DOOR-C/A-PERFORMED AFT LAV INSPECTION FOR ABNORMAL SMELL PER 12/6/21 WORKSCOPE. NO SMELL DETECTED. OPS CK GOOD IAW AMM 26-14-01-700-801-A. NO DEFECTS FOUND. A/C OK FOR SERVICE