As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE PRE-FLIGHT INSPECTION, IT WAS NOTICED THAT THE EXIT SIGN ABOVE THE MAIN CABIN DOOR WAS NOT ILLUMINATING WHEN INTENDED. ON FURTHER INVESTIGATION, FOUND THE CONNECTOR TO THE SIGN WAS UNSECURE. SECURED CONNECTOR AND OPS CHECK PRODUCED SATISFACTORY RESULTS. THE ACFT WAS RETURNED TO SERVICE.