As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, LEFT AFT CABIN READING LIGHTS WERE FLASHING. FLASHING STOPPED AFTER RESETTING READING LIGHT AND CALL LIGHT CIRCUIT BREAKERS BUT FLIGHT ATTENDANT NOTED ELECTRICAL SMOKE. AIRCRAFT RETURNED TO THE GATE WITHOUT INCIDENT. REPLACED OVERHEAD DECODER AT SEAT 36AB.