As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1621, LHR-BOS (ETOPS), NR 1 ENGINE IDG REQS REPLACEMENT DUE TO LEAK AROUND DRIVE SHAFT SEAL. R & R THE NR 1 IDG IAW AMM 24-21-51 REF L/P 4637336 ITEM 1 FOR OPS / LEAKS CHK. PERFORMED ENG NR 1 IDG OPS AND LEAK CHK PER AMM 24-21-51. OPS AND LEAK CHK GOOD.