As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - UPON GEAR EXTENSION THE ANTI SKID CAUTION LIGHT ILLUMINATED. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. MAINTENANCE PERFORMED A TEST OF THE SYSTEM, TEST FAILS. FOUND A CHAFED WIRE AT THE LEFT OUTBOARD TRANSDUCER (WHEEL SPEED). REPAIRED WIRE. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.