As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIC-PHL FLIGHT 3792. CREW REPORTED ALL CONTENTS OF NR 1 HYDRAULIC SYSTEM WERE LOST. EMERGENCY WAS DECLARED. MAINTENANCE REPLACED AN O-RING ON THE HYDRAULIC SHUT OFF VALVE AND REPLACED THE NR 1 HYDRAULIC PUMP. CASE DRAIN PRESSURE AND RETURN FILTERS WERE ALSO REPLACED. HYDRAULIC SYSTEM WAS SERVICED AND BLED. OPERATION AND LEAK CHECK WAS GOOD. AIRCRAFT RETURNED TO SERVICE.