As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS ON DECENT AT 6K ENG IDLE PSI 2.6 CABIN 500 FT PACKS ON BLEEDS NORMAL (DIRTY SOCKS SMELL FOR REMAINDER OF FLT). MAINTENANCE ACCOMPLISHED ODOR CARDS AND FOUND THE APU OIL COOLER FAN LEAKING. THE PLENUMS WERE FULL OF OIL AND ARE TO BE REMOVED AND CLEANED. MAINTENANCE REMOVED AND REPLACED THE OIL COOLER FAN IAW AMM 49-52-51. LEAK CHECK GOOD.