What was found
DURING PREFLIGHT CHECK IF THE EMERGENCY LIGHTS, NO EMER LIGHTS IN STATUS EUCAS ILLUMINATED. WE RAN THE APU TO CHARGE THE BATTIERS PER MAINTENANCE REQUEST FOR MORE THAN INE HOUR WITH NO STATUS CHANGE. A FULL POWER CYCLE WAS ALSO ACCOMPISHED WITH SIMILAR RESULTS. ALL INTERIOR AND EXTERIOR EMERGENCY LIGHTS APPEAR TO WORK. ARRIVED AND GAINED ACCESS TO AC. REMOVED NR 1 EMERGENCY LIGHT POWER SUPPLYDUE TO INOP, AND INSTALLED NEW #1 EMERGENCY LIGHT POWER SUPPLY . CLOSED ACCESS. ALLOWED TIME FOR POWER SUPPLY TO CHARGE. POWER SUPPLY IS CHARGED. PERFORMED OPS CHECK. OPS CHECK SATISFACTORY. ALL WORK DONE IAW AMM BD700-A-J33-53-09-00AAA. 09AUG2025