As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AUTO SHUTDOWN A SECOND TIME. DID NOT ATTEMPT RESTART PROG. GENERATOR INOP AFTER APU REPLACEMENT. DOES NOT COME ONLINE. APU PNEU OK, ONLY ELECTRICALLY INOP. TROUBLESHOT SYSTEM, RAN APU GEN WOULD COME ONLINE APPROX 5 T0 10 SEC THEN DROP OFF SWAPPED APU GCU WITH LEFT ENG GCU SAME RESULTS RETURNED GCU'S TO ORIGINAL POSITIONS. REMOVED AND REINSTALLED GENERATOR FEEDER WIRES IAW WDM24-21-41. OPS CHECKED OK.