As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA-APU DID NOT START AFTER ARRIVAL. RAMPERS REPORTED SMOKE OR FOG AND FLUID DRIPPING FROM APU BAY. MAINTENANCE CHECKED OIL LEVEL AND REPLENTISHED AS NECESSARY. NO FAULTS IN CDS. STARTED APU AND CHECKED FOR LEAKS, NO LEAKS NOTED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.