As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
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. ADD EMP:U168499,U332743 REF LP 7146882 SDR RAISED.