What was found
HAZE FILLED THE AIRCRAFT ON THE GROUND AND TRIGGERED THE LAV SMOKE ECAM. CREW REPORTED HAZE BEGAN FILLING CABIN IMMEDIATELY BEFORE APU START, AND AS FIRST OFFICER TURNED OFF GROUND AIR. APU AND PACKS WERE NOT RUNNING. PC AIR HAD BEEN RUNNING SINCE PLANE PARKED UNTIL APPROXIMATELY 11:15 ON GATE B17. RAN GROUND AIR DISCONNECTED FROM AIRCRAFT, NO SMOKE NOTED FROM GROUND AIR UNIT. CONNECTED GROUND AIR TO AIRCRAFT AND OPERATED IT, NO FUMES NOTED IN CABIN. CHECKED FWD AVIONICS BAYS, NO ABNORMAL SMELLS, SMOKE, OR FUMES NOTED. RAN DECISION TABLE SHEET 1 AMM 05-50-00-810-830-A PERFORMED CORRECTIVE ACTION TYPE 9,7,AND 4. NO FAULTS NOTED IN ASSOCIATION WITH FLIGHT DECK. SUSPECT GROUND AIR AT GATE TO BE FAULT DUE TO APU BEING OFF. LAV DETECTORS NORMAL, NO STATUS MESSAGES, CHECKED GROUND AIR CONNECTION- CLEAR. RAN APU WITH BOTH PACKS, NO ODD SMELL NOTED. NO 30 DAY HISTORY.