What was found
KPDX/KSJC - FLT 502 - NR 1 ENGINE LOST POWER DURING CLIMB. OIL PRESSURE WENT TO ZERO WHILE ENGINE STILL ROTATING AT 20 PERCENT N2. SHUT-DOWN PROCEDURES ACCOMPLISHED. MAINTENANCE INSPECTED THE NR 1 ENGINE INLET AND EXHAUST, NO DEFECTS NOTED. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE FUEL FILTERS. CHECKED THE OIL CHIP DETECTORS, NO CONTAMINATION FOUND. NR 1 ENGINE OPERATED NORMALLY ON GROUND RUN. (X)