What was found
DURING FLIGHT 3119, RT PROP OIL PRESSURE FLUCUATED THEN DROPPED TO ZERO INFLIGHT. TEMPERATURE AND LIGHT OPERATED NORMAL. RT PROP OIL PRESSURE FLUCTUATION BETWEEN 0-200 PSI OCCASIONALLY STEADY AT 100 PSI IN THE GREEN ARC. THEN WENT TO PSI AND STAYED. AIR RETURN TO MSP. MAINTENANCE REPLACED RT PGB OIL PSI X-DUCER PER SAAB AMM 79-30-5-4 AND REMOVED AND RE-INSTALLED RT OIL FILTER PGB FOR ACCESS. LEAK AND OPS CHECK GOOD. ALSO OHMED WIRING AT RT INDICATOR TO X-DUCER CHECK GOOD.