Both Man CR900 engines run the same temperature 190-192 at cruise 1800-1950 rpm. I had the thermostats (3 on each engine) replaced about a year ago and since then each engine has a different temp reading after coming down from cruise to idle. The starboard engine will read about 9 degrees cooler than the port. I believe the issue is with the starboard engine. The port when coming down to idle from cruise will read 187-189f and the starboard 178. I´m guessing one of the thermostats is either a different temp setting or is possibly sticking. Any ideas. I'm not overly concerned with the temp difference but would like to get both engines close to the same.