As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON ACTIVATION OF APU BLEED CABIN FILLED WITH FUMES STRONGEST AT AFT ROWS. DISAPATED WITH BLEED SHUTOFF. C/A: ACFT WAS NO FLT. NO OIL/HYD USAGE. NO EVIDENCE OF OIL IN APU COMPARTMENT.. APU INLET FOUND VERY DIRTY. REF LOG 6137579 FOR APU MEL. R/R BOTH RECIRC FILTERS PER A320 AMM 21-21-41. PERFORMED LEVEL A DECONTAMINTATION OF THE ECS PER A320 AMDS W/C 2100-2007. NO SMELL IN COCKPIT OR CABIN.