What was found
HAZE AND PLASTIC ODOR WAS DETECTED BY REAR FLIGHT ATTENDANT AFTER 3 MINUTES OF COMPLETING CHECKLIST (SHUTDOWN CHECK). APU WAS SHUTDOWN, EXTERNAL POWER USED AND EXTERNAL HEAT WAS TURNED ON. MAINTENANCE INSPECTED AIRCRAFT FOR POSSIBLE SMOKE. INSPECTED AFT SECTION (CARGO, APU, GALLEY, AVIONICS BAY) NO DEFECTS NOTED, NO SMOKE OR SMELL NOTED.