As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF LP 7144058, SDR RAISED PER GMM. REF LP 7144058 SDR RAISED PER GMM. LP - 7144058 DETAILS - EXIT PATH LIGHTS ON SEAT S ILLUM BTWN DOORS 3 AND 4. FIM TASK DMC-B787-A-33-50-F1-S8A-421A-A ACTIONED. TEST FAULTED CLASS 31 WELS CTRL UNIT, WELS CTRL UNIT CLASS 31 REPLACED IAW AMM 33-51-07. DATABASE UPLOAD CARRIED OUT AND FULL EMERGENCY LIGHTS SYSTEM TEST PASSED. EMERGENCY LIGHTS VERIFIED TO OPERATE NORMALLY.