As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING MAINTENANCE TESTING FOR TROUBLESHOOTING OF AN AUTO-SHUTDOWN AT THE PREVIOUS FLIGHT, OIL SPRAY REPORTEDLY ORIGINATED FROM THE OIL COOLER AND CAUGHT FIRE. THE FIRE WAS EXTINGUISHED USING EXTERNAL EXTINGUISHERS. NO OBVIOUS DAMAGE WAS REPORTED AT THIS POINT. THE APU WILL BE REPLACED.