As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATE GEAR EXTENSION, CREW REPORTS THAT WHILE ENROUTE THE RIGHT HYDRAULIC SYSTEM BECAME INOPERATIVE WITH ZERO PRESSURE INDICATION. CREW USED ALTERNATE GEAR EXTENSION TO LOWER THE LANDING GEAR. MAINTENANCE FOUND RIGHT ENGINE DRIVEN PUMP AND CASE DRAIN FILTERS CLOGGED. MAINTENANCE FLUSHED LINES AND REPLACED THE RIGHT EDP, CASE DRAIN FILTER, AND RIGHT SYSTEM FILTERS. THE AIRCRAFT WAS RETURNED TO SERVICE.