As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT REPORTED THAT THE EEPL EXIT SIGN AT THE AFT DOOR AND AT THE OVERWING EXITS IN THE CABIN WERE FLASHING ON & OFF AND WOULD NOT RESPOND TO COMMANDS DURING FLIGHT. MAINTENANCE REPLACED THE POWER SUPPLY AND BATTERY AT P1-119 AND THE FUNCTIONAL CHECK OF THE SYSTEM WAS GOOD.