As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ACRID ODOR THROUGHOUT CABIN (STRONGEST IN THE AFT CABIN) WITH ALL PACKS ON. DISSIPATES WHEN RECIRCULATING FANS ARE TURNED OFF. *S/D* FOUND OIL, GYCOL, WATER AND HYDRAULIC FLUID IN AREA OF APU INLET. CLEANED UP FLUIDS AND BURNED OUT PACKS. REPLACED ALL THREE COALESCER BAGS.