As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. FUMES NOTED AFTER TAKEOFF IN FORWARD PASSENGER CABIN AND IN COCKPIT. FUMES DISSIPATED SLIGHTLY AFTER REACHING CRUISE ALTITUDE. FUMES SMELLED LIKE DIRTY SOCKS. FUMES SUBSIDED WITH L PACK SELECTED OFF AND RESUMED WHEN L PACK SELECTED BACK ON. MAINTENANCE ACCOMPLISHED J/C 33L00021001 AND 33L00071001. FOUND LEFT ENGINE OIL, OVERSERVICED. ACCOMPLISHED DRAIN AND RESERVICE OF LEFT ENGINE OIL SYSTEM PER AMM 12-13-79.