As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPLEMENTAL SDR - DURING MAINTENANCE INSPECTION THE NUMBER 4 AFT EMERGENCY LIGHT WAS FOUND TO BE INOPERABLE. AIRCRAFT REMOVED FROM SERVICE. REPLACED THE NUMBER 4 AFT EMERGENCY LIGHT CHARGERS AND BATTERY IAW EMB AMM 33-50-04. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.