As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ODOR IN ACFT DURING TAKEOFF, DESCENT AND LANDING. DESCRIBED AS A SOUR ODOR. MAINTENANCE TROUBLESHOT CABIN AIR QUALITY AND JC 26L00021004, DECONTAMINATION OF ENVIRONMENTAL CONTROL SYS. FOUND SOURCE OF ODOR TO BE THE NR 2 ENGINE LPT SHAFT SEAL. REPLACED LPT PLUG O-RING IAW AMM 72-55-00-960-002-A. NO EVIDENCE OF OIL LEAK NOTED AFTER ENGINE RUN.