As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIGHTING EMER CHARGER L AFT CB POPPED WHEN EMER EXIT LIGHTS SWITCH PLACED IN ARMED POSITION.<[01] UPON TROUBLESHOOTING; FOUND EMERGENCY POWER SUPPLY(M1673) TO BE FAULTY. REMOVED AND REPLACED POWER SUPPLY AND BATTERY PER AMM 33-51-06. OPS CHECK GOOD.