What was found
FLT 6536 - IAD-RIC - DURING PREFLIGHT, EXPERIENCED A DISCREPANCY WITH THE EMERGENCY LIGHTS NOT SHUTTING OFF. FLIGHT CREW NOTIFIED MAINTENANCE CONTROL AND MAINTENANCE WAS NOTIFIED. MAINTENANCE TROUBLESHOT, REMOVED AND REPLACED THE ROOF PANEL EMERGENCY LIGHTS SWITCH IAW APPLICABLE MX PROCEDURES. ALL CHECKS WERE ACCOMPLISHED AS OUTLINED IN THE MM. AIRCRAFT WAS THEN RELEASED FOR SERVICE. (M)