What was found
(CAN) DURING FLIGHT THE PILOT NOTICED AN OIL LEAK COMING FROM THE RT ENGINE. INVESTIGATION FOR THE CAUSE REVEALED THAT CYLINDER NR 5 HAD NO COMPRESSION. ONCE THE ENGINE WAS REMOVED, WE NOTICED THAT THE PISTON MELTED AND HAD BROKEN SEGMENTS. WE REPLACED THE CYLINDER, PERFORMED A GROUND RUN AND EVERYTHING SEEMED NORMAL.