As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#43, JFK-LGW. (ETOPS) 'CLASS 2 MESSAGE: AC GEN ( CLASS II MX MSG - GPCU OR AC GEN ); REMOVED AND REPLACED GCU # 2 (1XU2) IAW AMM 24-22-34. OPS CHECK NORMAL. THIS CLEARS MDDR 555869. NO FAULTS OR MESSAGES NOTED AT THIS TIME. MX-4 UPDATED, PLACARD REMOVED.'