If you want someone to replace the cooling unit for you, then the folks at JC Refrigeration are who you need to talk to. The Amish-built cooling units work better than the original and you'll have the choice of sticking with the LP cooling unit or going to a compressor unit.
You'll only need to provide them with the fridge model number to get you going. You can also buy the cooling unit from them and install it yourself. Not that hard if you're moderately handy. About a 1-day job for most people working slowly.
Another option if you want to do the swap yourself is:
https://rvcoolingunit.com/Default.aspx
I got my cooling unit from them recently and they were great to work with. Also selling the Amish-built cooling units which work better than original. They come complete with everything you'll need for the swap.
If you move to a compressor fridge you'll have to do the math on your battery capacity to make sure that you have enough capacity to make it through any boon docking you plan to do. A compressor fridge will require more battery than an LP unit.