As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - ON TAXI FOR FLIGHT 2316 LOST COM 1 AND 2 AND STANDBY TAXIING OUT. RETURNED TO THE GATE. REMOVED AND REPLACED AUDIO ELECTRONIC CONTROL UNIT AND CAPT'S AUDIO CONTROL PANEL IAW CRJ AMM TASK 23-51-01-000-801-A01 & 23-51-01-400-801-A01, 23-51-04-000-801-B01 & 23-51-01-400-801-BO1. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.