What was found
IAD/TYS - FLT 6355 - DURING TAXI ON 9-4-97 AT 1615 HOURS, THE CREW EXPERIENCED A DISCREPANCY WITH THE FORWARD SECTION OF EMERGENCY FLOOR LIGHTING NOT OPERATING/ILLUMINATING DURING TEST. THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE WAS DISPATCHED. MAINTENANCE REMOVED AND REPLACED THE NR 1 EMERGENCY POWER SUPPLY IAW THE PROCEDURES AS OUTLINED IN THE MM. MAINTENANCE PERFORMED THE REQUIRED TESTS AS STATED IN THE MM. AIRCRAFT WAS THEN RELEASED FOR SERVICE. (X)