What was found
RDM - AIRCRAFT DIVERTED TO PDX, NR 2 HYDRAULIC SYSTEM QUANTITY DROPPED TO ZERO IN FLIGHT. NR 2 HYDRAULIC CAUTION LIGHT AND ASSOCIATED CAUTION LIGHTS ILLUMINATED. PERFORMED ALTERNATED GEAR EXTENSION METHOD NR 1. OPERATED AT ZERO QUANTITY FOR TEN MINUTES. REPLACED NR 2 STAINLESS STEEL PRESSURE LINE IN WHEEL WELL WITH FLEX LINE FOR TEMPORARY REPAIR. COMPLIED WITH ENGINE RUN FOR LEAK CHECK. NO LEAKS NOTED.