What was found
ON CLIMB OUT FROM FAR, GOT 'HYD 3 LO PRESS' CAUTION MESSAGE & HYD SYS 3 INDICATED '0' PSI. CREW C/W QRH PROCEDURE, DIVERTED TO MSP, PERFORMED MANUAL GEAR EXTENSION, DECLARED EMERGENCY & LANDED WITHOUT INCIDENT & NOT OVERWEIGHT. CREW NOTED HYD SYS 3 QTY INDICATED 5% AFTER LANDING (FLIGHT 4634 - FILED CLOSED) FOUND MAIN LANDING GEAR PRIORITY VALVE CRACKED AND LEAKING. / REMOVED AND REPLACED PRIORITY VALVE REF AMM 32-32-15 / LEAK CHECK GOOD / OPS CHECK REQUIRED PLEASE REFERENCE AML 822227 / PLEASE REFERENCE AML 822228