As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR FLIGHT 3505 THE CREW REPORTED THE APU EMITS STRONG FUMES IN THE CABIN. MAINTENANCE INSPECTED AND PLACED ON MEL. THEN FOUND APU OIL LEVEL TO BE TOO HIGH. THE OIL LEVEL WAS REDUCED TO PROPER LEVEL AND OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.