What was found
PILOT REPORTED THAT THE EMERGENCY LIGHTS WILL NOT ILLUMINATE WHEN THE SWITCH IS TURNED ON. LIGHTS IN THE BACK HALF OF THE AISLE MOMENTARILY FLICKER ON BUT THE FRONT HALF REMAIN DARK. MAINTENANCE REPLACED THE FORWARD, MIDDLE, AND AFT EMERGENCY LIGHT BATTERY PACKS. REPLACED EMERGENCY BUS CONNECTOR, K0519, PN: 111CC01AY1, SN OFF 13124, SN ON 10444 IAW MM 24-52-03, OPS CHECK GOOD.