What was found
FLT 4500 - DURING CRUISE FROM CVG-DFW, WITH THE EMERGENCY LIGHTS SWITCH IN THE ARMED POSITION, THE EMERGENCY LIGHTS CAME ON INTERMITTENTLY ACCOMPANIED BY A WHITE 'EMERGENCY LIGHTS ON' STATUS MESSAGE WITH NO OTHER ABNORMAL INDICATIONS. THE AIRCRAFT LANDED SAFELY IN DFW. MAINTENANCE REMOVED AND REPLACED THE AC ESSENTIAL BUS SENSE RELAY K135 IN JUNCTION BOX ELEVEN ON PRINTED CIRCUIT BOARD FIVE. OPERATIONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)