As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA - FLT 4541 - DURING APPROACH, CREW NOTICED MAIN AND EMERGENCY HYDRAULIC PRESSURE STARTED TO DROP. LANDING GEAR WAS EXTENDED USING EMERGENCY PROCEDURES. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND DUMP VALVE ON MAIN AND EMERGENCY ACCUMULATOR HAD FAILED. BOTH DUMP VALVES WERE REPLACED. SYSTEM CHECKED GOOD. EMERGENCY VALVE P/N 3268, S/N 315. (M)