As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED AN ACRID OILY ODOR FROM PACKS WITH APU AIR AND ENGINE SUPPLYING AIR. ODOR BURNS THE EYES AND THROAT DURING ALL PHASES OF FLIGHT. AIRCRAFT WAS GROUNDED. FOUND APU LEAKING AT DRAIN PLUG BOSS, MOUNT FLANGE, AND CONNECTOR BASE. REPLACED APU GENERATOR IAW AMM 24-23-51