What was found
EMERGENCY LIGHTS ON STATUS MESSAGE ON EICAS INTERMITTANT THROUGH OUT FLIGHT. EMERGENERY LIGHTS SWITCH WAS IN ARM POSITION & THE EMERGENCY LIGHTS DID NOT ILLUNATE IN CABIN WHEN EMERGENCY LIGHTS STATUS MSG CAME ON. SELECTING EMERGENCY LIGHTS ON AT THE SWITCH. THE EMERGENCY LIGHTS WOULD ILLUMINATE. TROUBLESHOT TO COCKPIT EMERGENCY BATTERY POWER SUPPLY. REMOVED COCKPIT POWER SUPPLY INSTALLED COCKPIT EMERGENCY LIGHT POWER SUPPLY. SYSTEM OP-CHECKS GOOD AT THIS TIME.