As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SOUR AND FOUL SMELL FROM AC SYSTEM SMELLS LIKE DIRTY SOCKS OCCURED AFTER TAKEOFF. A-C SYS OIL CONTAMINATION ISOLATION PER AMM 21-00-01 PB200 REVEALED OIL CONTAMINATION LIKELY FROM NR 1 ENGINE. NR 1 ENGINE HAS OIL POOLING IN NR 3 AFT CARBON SEAL AREA VIEWED THRU AP1. REPLACED NR 1 ENGINE PER TOD 71-00-02.