As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - BRAKES ARE MUSHY. SIGNIFICANT EFFORT ON PEDALS RESULTS IN NO BRAKING. HIGH FORCE APPLIED TO PEDALS RESULTS IN ADEQUATE BRAKING. MAINTENANCE TAXIED THE AIRCRAFT WITH THE ANTI-SKID ON AND OFF WITH NO DEFECTS NOTED. BRAKING FORCES ARE NORMAL. COULD NOT DUPLICATE. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.