As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX: YAW DAMPER ONE WON'T ENGAGE. POWERED DOWN A/C AND DID NOT CLEAR PROBLEM. FERRIED TO SLC. SLC: CAPTAIN'S AHRS FAILURE. RED FD, ATT & MAG MESSAGE ON PFD. RED MAG MESSAGE ON MFD. REMOVED AND REPLACED NR 1 AHRS PER CRJ MM 34-21-01. OPS CHECK GOOD. FCC DIAGNOSTICS AND MDC INDICATE NR 1 AHRS OPS CHECK GOOD. NO FAULTS NOTED.