As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A SCHEDULED MAINTENANCE VISIT WHILE PERFORMING APU METER READINGS, THE APU EXHAUST WAS FOUND TO HAVE AN EXTENSIVE LEAK WHERE THE EXHAUST FLANGE MOUNTS TO THE AIRFRAME. THE EXHAUST GASKETS WERE REPLACED. OPERATIONAL CHECKS WERE GOOD, AND THE AIRCRAFT WAS RETURNED TO SERVICE.