As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE APU FAILED DURING TAXI. THEY INDICATED THIS WAS THE FORTH TIME IT HAD FAILED. THE MAINTENANCE TEAM TROUBLESHOT AND DETERMINED THE APU LOW OIL PRESSURE SWITCH WAS DEFECTIVE. A NEW APU LOW OIL PRESSURE SWITCH WAS INSTALLED. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.