As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER INSTALLATION VALVE OPERATION FELT NORMAL. AFTER 1ST FLIGHT THE VALVE STIFFENED UP (WHILE UNDER HYDRAULIC PRESSURE) AND WAS DIFFICULT TO SHUTOFF IN THE FIRST INCH OF TRAVEL. OPERATES NORMAL WITH NO PRESSURE. 2ND REPLACEMENT VALVE WORKS FINE.