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 AFTER T.O. WHEN RE-CONFIG FROM APU BLEED TO ENG BLEED, ODOR FILLED CABIN & COCKPIT, DISSIPATED SHORTLY THERE AFTER, ALL SIGN OF ODOR GONE AFTER 30MIN. MAINTENANCE FOUND APU OIL COOLER LEAKING. REMOVED AND REPLACED APU OIL COOLER AND FAN ASSEMBLY. CLEANED APU COMPARTMENT IAW AMM 49-00-00. NO FURTHER ODORS NOTED.