As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT BLUE HAZE AND FAINT SMOKE IN CABIN ON TAKEOFF. HAZE SOON DISSIPATED. AFTER LANDING DURING TAXI IN, SMOKE AND ODOR APPEARED AGAIN. PACKS SHUT DOWN AND SMELL AND HAZE DISSIPATED AGAIN. FOUND APU OIL SERVICE CAP WITH WORN GASKET. REPLACED APU OIL SERVICE CAP AND PERFORMED PACK BURN. SYSTEM GROUND CHECKED NORMAL OPERATION.