As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG FUME ODOR THROUGHOUT THE AIRCRAFT AFTER STARTING THE APU AFTER LANDING. THE AIRCRAFT WAS GROUNDED DUE TO THE DISCREPANCY. MX FOUND APU OIL PAST FULL - CORRECTLY SERVICED APU OIL QTY. PERFORMED AC PACKS OPS CK WITH ENGINES RUNNING AND WITH APU OPERATING. REF AMM 21-51-00-710-002. NO FUME ODOR NOTED, OK FOR SERVICE.