As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING GEAR RETRACTION, BOTH HYDRAULIC FLOW AND LOW PRESSURE ANNUNCIATOR LIGHTS ILLUMINATED. FLIGHT WAS ABORTED AND DIVERTED BACK TO PHF (ORIGINATING AIRPORT). LANDING GEAR WAS EXTENDED BY THE EMERGENCY EXTENSION SYSTEM WITH NO FURTHER ABNORMALTIES. MAIN SYSTEM HYDRAULIC FAILURE AS A RESULT OF CRACKED PRESSURE SUPPLY TUBE, PN 6317003-48, TO LOADING VALVE (BYPASS VALVE). FAILED TUBES REPLACED WITH FACTORY-NEW PARTS. LANDINGS: 3,710.