As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO - SMOKE DETECTION LIGHT ACTIVATED ON TAXI-OUT. AIRCRAFT RETURNED TO GATE. NO SMOKE OR FIRE DETECTED. DETERMINED TO BE FALSE INDICATION. CLEANED SMOKE DETECTOR. SMOKE DETECTION SYSTEM OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)