As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYZ INFLIGHT T1311/11JUN - CREW REPORTED ODOR AND HAZE IN CABIN DURING ROTATION. RETURNED TO YYZ AND LANDED WITHOUT INCIDENT. FOUND OIL DRIPPING FROM APU INLET AND OIL TANK OVER SERVICED. ACCOMPLISHED WORK CARD 21 96 01 FOR CABIN ODOR AND PACK BURN WORKCARD 21 92 12. SYSTEM GROUND CHECKED NORMAL OPERATION.