As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU STARTED AFTER LANDING. PUT GENERATOR ON LINE. A MINUTE LATER, THE APU AUTOMATICALLY SHUTDOWN. ACFT GROUNDED. REMOVED AND REPLACED APU SPEED SENSOR ASSY IAW AMM 49-61-21. ACCOMPLISHED APU STARTING AND OPERATION, NO LEAKS NOTED. LOADED APU, NO FAULTS NOTED. OPS CHECKED GOOD IAW AMM 49-11-00-860-801. ACCOMPLISHED APU BITE PROCEDURES. NO CURRENT FAULTS NOTED IAW AMM 49-61-00-700-801.