As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4078, CREW REPORTED ON DESCENT WHEN SELECTING GEAR DOWN NR 3 HYD PRESSURE AND QUANTITY WENT TO ZERO, DECIDED TO DO A FLY BY AND DECLARED AN EMERGENCY. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED FLOW LIMITER VALVE PER CRJ AMM 29-12-13 AND 8194; AIRCRAFT RETURNED TO SERVICE.