As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA-APU FIRE WARNING. APU AUTO SHUT DOWN AND AGENT DISCHARGED. FOUND WE1-114 AND WE14-114 CONNECTION TO APU FIRE LOOP SHORTED. REPLACED. REPLACED BOTTLE.APU FIRE EXT SYS OPS CHECKS AS PER F-28 MM 26-13-01. PAGE 202, ITEM 2. AIRCRAFT RETURNED TO SERVICE.