What was found
INTERIOR CABIN EMERGENCY LIGHTS ABOVE SEATS 2L AND 3R DON NOT ILLUMINATE WITH EMER LIGHT SWITCH PLACED TO ON FOR PREFLIGHT. GAINED ACCESS TO POWER SUPPLIES IN LOWER SIDEWALL AND BEHIND GALLEY AND SWAPPED POWER SUPPLIES PN 2013-1A SN 120510 AND PN 2013-1A SN 120296 AND FOUND NO CHANGE IN DISCREPANCY. REPLACED PREVIOUSLY SWAPPED POWER SUPPLIES INTO THEIR ORGINAL LOCATIONS WITH FURTHER INSPECTION FOUND ADDITIONAL EMERGENCY LIGHT POWER SUPPLY PN BR9767-001 SN C1473 INSPECTED UNIT AND FOUND CANNON PLUG DISCONNECTED. RESUCURED CONNECTOR PLUG TO SAID POWER SUPPLY AND PERMED OPERATIONAL CHECKS WITH NO DEFECTS NOTED ALL WORK COMPLETED REF CHALLEGER 350 AMM 33-51-17 AND 33-50-00-710-801.