As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE TO GSO BOTH DISPLAY FANS WENT INOP. THE CREW DECLARED AN EMERGENCY AND RETURNED TO CLT WHERE THEY LANDED WITHOUT FURTHER INCIDENT. REMOVED AND REPLACED #1DISPLAY SUPPLY FAN AND CHECK-VALVE IAW CRJ 900 AMM. OPS CHECK GOOD AT THIS TIME.