As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PUSING BACK FROM GATE AT JAX, FLIGHT ATTENDANT REPORTED SMOKE FROM OVERHEAD BIN AROUND ROW NR 9. AIRCRAFT WAS TOWED BACK TO THE GATE AND PASSENGER DEPLANNED. ALL POWER WAS REMOVED, UPPER BEACON CIRCUIT BREAKER WAS FOUND POPPED. MAINTENANCE IN JAX FOUND UPPER ANTI-COLLISION BEACON DEFECTIVE. ITEM WAS DEFERRED PER MEL 33-6. REMOVED AND REPLACED UPPER ANTI-COLLISION LIGHT, OPS CHECK OK. (M)