Original 1991 freezer system still works on our P42. Refrigerator system Control Module died many years ago and replaced it. Evaporator and compressor were still good. System worked just fine up until 2015 when the compressor died so replaced the entire system. A chore getting the old stuff out, but here is an article that I wrote about the project.
https://hunter.sailboatowners.com/mods.php?task=article&mid=45&aid=8342&mn=42
Purchased the AB system through Defender for around $1,400. That included the compressor, thermostat, condenser and their larger evaporator box. Evaporator box was a tight fit, but it all works. Chose not to purchase the evaporator plate; almost twice the price of the box. Besides would have had to bend the plate 90 degrees to match the original. Just too risky.
Original system used R-12 refrigerant.