As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. DURING EMERGENCY LIGHT TEST FAULT EMERGENCY POWER SUPPLY UNIT. [11WL] EMER L/ DEU B [300RH6] WAS ON MCDU. WHILE TROUBLESHOOTING THIS ISSUE MAINTENANCE ISOLATED THE ISSUE TO THE EMERGENCY LIGHTS FOR SEATS 22 AND 23 ABC BEING INOPERATIVE CAUSED BY BROKEN WIRES AFT OF CONNECTOR 7260VC8A. REPAIRED BROKEN WIRES PER WDM 33-51-08 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.