As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU INOP ELECTRICAL. UNABLE TO LOAD GENERATOR. CREW COMMENTS: APU GEN CONTROL WON'T RESET. AFTER TROUBLESHOOTING PROBLEM FOUND, HMG STUCK IN OPEN POSITION. APU GENERATOR WILL NOT STAY ON LINE. TRIPS OFF LINE. REPLACED APU GENERATOR. OPS CHECK NORMAL.