As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - ON TAXI, THE FIRE DETECTION LIGHT WAS FLASHING AND THE FAULT "B" LIGHT ILLUMINATED WITH A FLASHING INDICATION. RETURNED TO THE GATE AND PLACED THE SYSTEM ON MEL 26-1. AIRCRAFT RETURNED TO SERVICE. 4/5 MEL CLEARED BY PERFORMING A RESISTANCE AND QUANTITY CHECK OF THE SYSTEM WIRING WITH NO DEFECTS NOTED. ALSO APPLIED SUPER CORR A TO ALL CONNECTORS REMOVED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.