As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING PUSH BACK STRONG ODOR OF BURNING OIL IN CABIN ALONG WITH A SLIGHT HAZE. REPLACED GEARBOX SUPPLY LINE PACKINGS (AALA202103069015) PER AMM 49-91-00. ALSO REPLACED COOLING FAN (AALA202103089022) PER AMM 49-52-51.