As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PRE FLIGHT CREW NOTED THAT THE CEILING EMERGENCY LIGHT AT ROW 3 WAS NOT ILLUMINATING AS REQUIRED. MX DISCOVERED THE CONNECTOR FOR THE LIGHT WAS UNPLUGGED. RECONNECTED AND PERFORMED AN OPS CHECK THAT PRODUCED SATISFACTORY RESULTS. THE ACFT WAS RETURNED TO SERVICE.