As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CREW REPORTS OIL/MUSTY SMELL ON DECENT IN COCKPIT AND AFT CABIN. ALSO PRONOUNCED ON THE GROUND IN THE COCKPIT WHEN ON APU BLEED AIR. MAINTENANCE FOUND THE PTU LEAKING. REMOVED AND REPLACED THE PTU IAW AMM 29-23-41. OPS AND LEAK CHECK GOOD.