What was found
PILOT REPORTED THE RT ENGINE OIL PRESSURE WAS HIGH ON THE GROUND NEAR RED LINE, BUT WOULD FALL IN PRESSURE AT ALTITUDE, THE HIGHER THE ALTITUDE, THE LOWER THE OIL PRESSURE WOULD FALL REACHING BOTTOM RED LINE AT 12,000 FEET. THE OIL PRESSURE SPRING WAS REPLACED AND THE VALVE AND SEAT WERE LAPPED HAVING NO CHANGE IN PROBLEM. THE OIL PAN WAS THEN REMOVED AND ORANGE RTV WAS FOUND IN SUCTION TUBE BLOCKING APPROXIMATELY 90-95 PERCENT OF SCREEN.