As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. AFTER STARTING APU INFLIGHT 5 MINUTES IN, THE APU GENERATOR TRIPPED OFFLINE. COUPLED WITH THE LEFT GENERATOR FAILURE IN MIC# 34440469 - WE DECLARED EMERGENCY AND LANDED IN AUS. LANDED WITHOUT INCIDENT, FLIGHT CHANGED EQUIPMENT AND CONTINUED. REPLACED APU GENERATOR CONTROL UNIT PER AMM 24-20-07. (SEE ALSO SDR #'S: AALA20180628017 & AALA201806299005)