As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#7, JFK-LHR. (ETOPS) 'DURING PDSC AC GEN ON ECAM ( CLASS II MX MSG - GPCU OR AC GEN ). REMOVED AND REPLACED GCU #1 IAW AMM 24-22-34. PERFORMED ENG # 1 AND 2 IDLE RUN PER REF 24-22-34-710051-1. CONFIRMED NO FAULTS. ALL OPS NORMAL. MDDR CLEARED. MX-4 UPDATE. PLACARED REMOVER.