As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE EMERGENCY LIGHT SWITCH AT THE ATTENDANT PANEL IS INOPERATIVE. LIGHTS WILL NOT TURN ON WHEN SWITCHED TO ARM (ON). TROUBLE SHOT PER B717 SDS 33-51-00-003 & WDM 33-51-11 AND SUSPECT B5-125 BATTERY PACK. REPLACED THE OVERWING EMERGENCY EVACUATION BATTERY PACK PER B717 AMM 33-51 AND NOW THE OPERATIONAL CHECK IS GOOD.