As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. CREW REPORTED OILY/MUSTY ODOR IN COCKPIT AND AFT CABIN ON TAKEOFF AND CONTINUED UNTIL TAXI IN. FOUND APU OIL COOLER FAN LEAKING. REMOVED AND REPLACED OIL COOLER FAN ASSEMBLY PER AMM 49-52-51 AND ACCOMPLISHED JOB CARDS 26L00021001, 26L00021002 AND 26L00021004. OPERATIONAL CHECK GOOD.