As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AHM ALERTED MMSG 33-11416, CLASS 16. L3 DOOR AFT G1 REMOTE WELS CONTROL UNIT BATTERY POWER FAILED. THIS HAS ALERTED THE LAST 3 CONSECUTIVE FLIGHTS. T/S IAW FIM B787-A-35-50-F1-T6A- 421A-A. ON INITIAL EVALUATION, PERFORMED AN EMERGENCY LIGHTS OPS TEST, AMM B787-A-33-51-00-00C-320A-A. WCU 16 M3351090 BATTERY FAILED. R & R WBU IAW AMM DMC-B787-A-33-51-07-02B. OPS CHKD GOOD.