As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB CH 1 INOP STATUS MESSAGE ON TAXI OUT. CH 1 WOULD NOT RE-ENGAGE. RETURNED TO GATE. STAB CH 2 FAIL DURING TROUBLESHOOTING HSTCU BITE CODE MOTOR 2 FAIL DISPLAYED. CHANNEL 2 FAIL WOULD NOT RESET, REMAINED DISPLAYED. REMOVED AND REPLACED MCU & HSTCA IAW CRJ MM 27-40-00. P/N: 7062-3, S/N OFF: 1004, S/N ON: 804.