As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L2 DOOR FORWARD REMOTE WIRELESS EMERGENCY LIGHTING SYSTEM CONTROL UNIT HAS AN INTERNAL FAULT. MAINTENANCE TROUBLESHOT IAW FIM B787-A-33-50-F1-35A-421A-A AND REPLACED WIRELESS EMERGENCY LIGHTING CONTROL UNIT. RELOADED SOFTWARE AND PEFORMED SATISFACTORY OPERATION CHECK AND CLEARED FAULT.