What was found
EN ROUTE TO CLT THE CREW GOT A RUDDER LIMITER CAUTION MESSAGE. THEY RAN THE QRH AND DECLARED A EMERGENCY. THE EMERGENCY VEHICLES DID ROLL BUT WERE NOT NEEDED. THE AIRCRAFT WAS ABLE TO TAXI TO A GATE UNDER ITS OWN POWER WITHOUT ANY FURTHER ISSUES. NO BRACE WAS CALLED BY THE CREW. NO FURTHER INFORMATION HAS BEEN PROVIDED. RUD LIMITER CAUTION MSG INFLIGHT. QRH COMPLETED ED 1 INOP ED 2 INOP, STEERING DEGRADED, LEFT FADEC FAULT 2 RIGHT FADEC FAULT 2 SIMULTANEOUSLY / CBP-2 Q1 AND U8 POPPED FOR DCU1 REMOVED AND REPLACED DCU1 IAW CRJ700 AMM 31-41-04-000/400-801 OPS TEST GOOD. ALL RELATED MSG'S DID NOT RE-APPEAR.