As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 31 BOS-AMS (ETOPS). MAINTENANCE AC GEN MESSAGE ON STS PAGE ( CLASS II MX MSG - GPCU OR AC GEN ). ACCOMPLISHED SUCCESSSFUL OPS CHECK AND GROUND VERIFICATION OF # 2 IDG PER AMM SUBTASK 24-21-51-720-064-A AND 24-21-51-720-065A OPS NORMAL NO LEAKS NOTED.