What was found
ENGINE HAS 40.0 HRS SINCE MAJOR OVERHAUL AT WHICH TIME NEW TCM CYLINDERS WERE INSTALLED. COMPRESSION CHECK SHOWS NR 1 CYLINDER AT 40/80 LEAKING THROUGH EXHAUST VALVE AND CYLINDERS NR 2, 3, 5, AND 6 TO BE AT 70/80 WITH SLIGHT EXHAUST VALVE LEAKAGE. BORESCOPE INSPECTION SHOWS NR 1 CYLINDER TO HAVE A VERY NARROW EXHAUST VALVE SEAT WITH LIGHT CONTACT. COMPRESSION READINGS ON THE ABOVE CYLINDERS ARE OUTSIDE THE LIMITS SPECIFIED IN TCM SB M84-15, DATED DEC 21, 1984.