What was found
ON PREFLIGHT WITH AIRCRAFT BATTERIES OFF AND EMERGENCY EXIT LIGHTS SELECTED TO ARM, THE EMERGENCY LIGHTS FOR OVERHEADSEAT 7 AND EVACUATION PATH LIGHTS FOR SEATS 5 AND 8 DO NOT ILLUMINATE. IF YOU SELECT AIRCRAFT BATTERIES ON AND EMER LIGHTS ON, THOSE LIGHTS NOW WORK. SAME PROBLEM WE HAD YEATERDAY WE WROTE AIRPLANE UP FOR. REMOVED #3 EMERGENCY BATTERY PACK P,N:CBS28-1, 1 SN 007816 AND REPLACED WITH A REPAIRED UNIT IAW CE-680A MM 33-50..06. PUE TO EMERGENCY LIGHTS FOR OVERHEADSEAT 7 AND EVACUATION PATH LIGHTS FOR SEATS5 AND 8 DO NOT ILLUMINILTE. OPS CHECK GOODL