As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING APU OPERATION, THE COCKPIT RECEIVED AN "APU BLEED AIR LEAK" MESSAGE. FOLLOWING SHUTDOWN, INSPECTION FOUND A FRACTURED LOAD COMPRESSOR DIFFUSER PIPE. WHICH HAD DAMAGED THE AIR DUCT AND HAD TRAVELLED DOWNSTREAM TO DAMAGE THE OZONE CONVERTER.