As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3142 - EWR - CREW REPORTED APU GENERATOR AND GENERATOR NR 1 OFF BUSS. CREW PERFORMED AIR RETURN AND LANDED ACFT UNEVENTFULLY. EWR MX REMOVED AND REPLACED APU GCU AND GENERATOR NR 1 AND PERFORMED OPERATIONAL CHECKS SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.