OK so now I have control board 3109226.005 and Freeze Guard sensor 3312303.005 that I ordered from Amazon. I was not able to get Dometic T-stat 3109228.001 (white) or Dometic T-stat 3109228.019 (black) primarily due to cost although a search on the internet found some sources. I did learn that a Dometic Comfort Control 5 Button direct replacement from Micro - Air is their EasyTouch RV 357 (Black) ASY-357-X01 and is supposed to work with the control board 3109226.005 and Freeze Guard sensor 3312303.005.
I chose to use the Micro-Air T-stat due to the Enhancements of Bluetooth and WIFI connectivity standard in all thermostats. Control your RV A/C remotely anywhere right from your phone or tablet. A large color touch screen with High and low temperature notifications. Multiple zone control remotely (needed when I add an A/C unit to bedroom) plus all the features of the original 5 button thermostat.
http://www.micro-air.com/support documents/EasyTouchRV/EasyTouchRV_357_Manual_1.7.pdf
I have received everything I need now to make the conversion and as soon as I have time will proceed, probably after I arrive in Gulfport, MS around Nov 9th as I will be there for 3 weeks.