What was found
UPON COMPLETION OF LAST FLIGHT OF DAY & POST FLIGHT SHUTDOWN AND INSPECTION, DISCOVERED EMERGENCY LIGHTS IN AFT OF PLANE ON & COULD NOT EXTINGUISH (EXIT SIGN ABOVE TOILET, EMER LIGHT ABOVE TOILET, FLOOR LIGHT BELOW TOILET, & EXIT SIGN ON BULKHEAD ABOVE SEAT 7). PER MCC INSTRUCTION TRIED 5G RESET SWITCH BUT ALL LIGHTS REMAINED ON. ARRIVED ON SITE. GAINED ACCESS TO ACFT. APPLIED POWER & DUPLICATED PILOTS DISCREPANCY. AFTER CYCLING G-SWITCH FOR EMMER BATT #4 SEVERAL TIMES & COMPLETING A POWER CYCLE FAULT CLEARED. PERFORMED INCOMING RECEIVING INSPECTION OF CUSTOMER SUPPLIED NEW SWITCH WITH NO DEFECTS NOTED. REMOVED & REPLACED SWITCH P/N 7607-2-000 REFERENCED AMM 33-50-11. OPS CHECK GOOD.