As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2290 - ON TAXI, RECEIVED A ANTI-SKID OUTBOARD CAUTION MESSAGE AND A SPOILER STAB FAULT. RETURNED TO THE GATE. MAINTENANCE FOUND THE BACKSHELL OF THE NR 1 WHEEL SPEED TRANSDUCER NOT ENGAGED. RESECURED AND RESET SSCU'S. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.