What was found
#1 HYD QTY DROPPED TO ZERO IN CRUISE. STARTED WITH A #1 HYD ISO VLV CAUTION + ROLL SPLR OUTBD HYD CAUTION WITH ABOUT 15% QUANTITY LEFT THEN SLOWLY BLED TO ZERO. DIVERTED AND ACCOMPLISHED A UNEVENTFUL LANDING. REMOVED FROM SERVICE. FOUND #1 HYDRAULIC PRESSURE LINE FROM FIREWALL TO FILTER MANIFOLD DAMAGED. REPLACED. DEBRIS FOUND IN ENGINE DRIVEN PUMP, REPLACED. REPLACED !/2 MAIN TIRES DUE TO HYD CONTAMINATION.