As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2585 - ON TAXI RECEIVED A SSCU NR 1 FAULT. RETURNED TO THE GATE. MAINTENANCE REVIEWED THE MDC AND FOUND A SSCU1 CHANNEL A COMMUNICATIONS FAULT. REINITALIZED SSCU AND PERFORMED SELF TEST. CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.