As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT REPORTED THAT AFTER ARRIVAL AT THE GATE AND FOLLOWING GROUND POWER CONNECTION, THE EMERGENCY PATHWAY LIGHTING CHARGING SYS CIRCUIT BREAKER POPPED AND WOULD NOT RESET. MX FOUND A WIRE CHAFING AT BATTERY PACK B5-40 AND REPAIRED IT. FUNCTIONAL CHECK OF THE SYS IS GOOD.