As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4596, CREW REPORTED HYDRAULIC SYSTEM 1 FAIL ON CLIMB. CREW DECLARED A EMERGENCY AND RETURNED TO BLOCK WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NR 1 MANIFOLD ASSEMBLY PER EMB 140 AMM 27-12-02 LEAK AND OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.