As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED FWD(4) OVERHEAD CENTER LIGHTS CAME ON IN FLIGHT, WILL NOT EXTINGUISH. ALL OTHER EMERGENCY LIGHTS OPERATE AS PRESCRIBED. REMOVED & REPLACED EPSU BATTERY PACK AT PS36&EPSU BATTERY CHARGER IAW CRJ900 AMM 33-51-17. OPS CHECK GOOD ALL LIGHTS ILLUMINATE AS REQUIRED.