As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED, DURING DESCENT AND APPROACH A LINGERING OIL / DIRTY MUSTY SMELL WAS REPORTED. FOUND APU OIL COOLER FAN LEAKING OIL, REPLACED OIL COOLER FAN AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 49-52-51.