As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELEC GEN OFF L2. ADVISORY. L2 ENGINE DRIVEN GENERATOR IS OFFLINE. SWAPPED L2 GCU WITH L2 APU GCU ACC AMM DMC-B787-24-22-02-01A- 520A-A AND APPLIED MEL2422AE TO LEFT APU GEN L2 GCU. L2 GCU NOW P/N 7000053H03 S/N AAEM002448 L2 APU GCU NOW 7000053H03 S/N AAEM002479