As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 36 LAX - PHL - CABIN ODOR - DIRTY / MUSTY ODOR THROUGHOUT ENTRE AIRCRAFT ON GROUND WITH PACKS ON WHICH WORSENED AFTER TAKEOFF AND CLIMB. ODOR SLOWLY DISSIPATED DURING CRUISE BUT RETURNED ON DESCENT. ODOR CAUSED EYE AND THROAT IRRITATION TO ALL CREW MEMBERS. MAINTENANCE FOUND O-RING BROKEN AT APU OIL FILTER MODULE - REPLACED O-RING, FILTER AND CLEANED APU INLET. ALSO REPLACED ALL OZONE AND RECIRCULATION FILTERS.