As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT ATTENDANTS REPORTED CEILING/OVER DOOR EXIT LIGHTS NOT ILLUMINATING. ALL LIGHTS IN FLIGHT, CAME ON AT GATE. MAINTENANCE INSTALLED NEW EXIT SIGN ON CEILING ABOVE ROW 14 PER MM 33-51-11. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.