What was found
DURING ROUTINE MAINTENANCE, IT WAS DISCOVERED THAT EMERGENCY LIGHTS WERE OUT AT ROWS 25, 21, 17, AND 3. EMERGENCY EXIT SIGN ABOVE THE R2 DOOR WAS INOPERATIVE. EMERGENCY EXIT SIGN ABOVE THE L2 WAS INOPERATIVE. R2 SIDEWALL EMERGENCY LIGHT WAS INOPERATIVE.REPLACED THE LAMPS AT ROWS 25, 21, 17, AND 3 IAW AMM 33-51-18. REPLACED THE LAMPS AT THE R2 DOOR SIGN. FOUND EMERGENCY POWER SUPPLY UNIT TO BE FAULTY DURING TROUBLESHOOTING. R & R THE EPSU IAW AMM 33-51-38, OPS CHECKED GOOD.