As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - SMOKE DETECTION LIGHT CAME ON DURING TAXI OUT. AIRCRFT RETURNED TO GATE. MAINTENANCE FOUND AIR CONDITIONING SYSTEM RECIRCULATION FAN TO HAVE FAILED CAUSING SMOKE DETECTION LIGHT ILLUMINATION. MAINTENANCE DEFERRED RECIRCULATION FAN PER MEL 21-4. AIRCRAFT RETURNED TO SERVIE. MAINTENANCE SUBSEQUENTLY REPLACED RECIRCULATION FAN. (M)