What was found
(CAN) ON A MEDEVAC FLIGHT THE CREW OBSERVED THE RT ENGINE OIL PRESSURE REGRESSING. THE CREW CONDUCTED A PRECAUTIONARY ENGINE SHUTDOWN IAW THE SOP AND PROCEEDED TO DESTINATION WITH AN UNEVENTFUL LANDING. MAINTENANCE FOUND THE RT ENGINE OIL COOLER HAD A SEAM CRACK, THE CRACK WAS REPAIRED AND THE AIRCRAFT RETURNED TO SERVICE. ON THE RETURN FLIGHT THE CREW OBSERVED THE RT ENGINE OIL PRESSURE REGRESSING. THE CREW CONDUCTED A PRECAUTIONARY ENGINE SHUT DOWN AS PER THE SOP AND PROCEEDED ON TO THE AIRPORT FOR AN UNEVENTFUL LANDING. MAINTENANCE HAS FOUND THE REPAIRED SEAM CRACKED ON THE TOP OF THE WELD AND IS INVESTIGATING THE REPAIR PROCESS.