What was found
FLIGHT 7548 DEN TO CID CREW REPORTED WHILE DEPLANING, RECEIVED A LAV SMOKE EICAS MESSAGE AND THE AFT CABIN HAD A SLIGHT HAZE TO IT. CREW TURNED OFF THE RECIRC FAN AND SHUT DOWN THE APU. MAINTENANCE INSPECTED LAV AND CABIN AREA, RAN APU, PACKS AND RECIRC FAN AND COULD NOT INDUCE SMOKE OR SMOKE INDICATION. HAS NOT DUPLICATED THIS DATE.