As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW LOST HYDRAULIC SYSTEM 3 DURING APPROACH INTO ATL. THEY DECLARED AN EMERGENCY AND LANDED WITHOUT FURTHER INCIDENT. MX REPLENISHED HYDRAULIC SYSTEM 3 TO CORRECT LEVEL . REMOVED AND REPLACED #3B HYDRAULIC PUMP DUE TO HYDRAULIC FLUID STARVATION IAW CRJ 900 AMM