I have spent the last few days trying to finish this build.

I had to try learn the requirements of components I couldn't replace, as well as try glean how this fridge's controller is meant to work.

In the end, I am in the process of designing 2 separate protoboard circuits to run the fridge. The reason I am making 2, is since one only requires 5VDC and I think separate boards will make installation easier. I am using 2 cheap ($2.50) USB chargers for my control and switching DC circuits and otherwise, as many components reclaimed from the original PCB.

I should finish the designs and first build today.

EDIT: Circuit designs are complete, now to build them :-)