As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HOT/STL - AFTER GAINING CRUISE ALTITUDE EN ROUTE, THE PILOT NOTICED THAT HYDRAULIC PRESSURE WAS FALLING AND DID FALL OFF COMPLETELY. THE PILOT THEN DIVERTED AND RETURNED TO HOT, LANDING WITHOUT FURTHER INCIDENT. INSPECTION REVEALED THE RIGHT ENGINE MAIN HYDRAULIC LINE HAD CRACKED ALLOWING ALL FLUID TO BE DUMPED OVERBOARD. MAINTENANCE REPLACED THE LINE, CLEANED ENGINE AND WHEELWELL AREA, GROUND RAN AND ALL SYSTEMS CHECKED NORMAL.