I have an 12V Adler Barbour Compressor that is labeled combicold cc-20-AW that I believe to be original to my 1987 Hunter Legend. It has 2 cold plates mounted in the freezer with spillover to the frig. It worked well until now but it appears the compressor has given up. It has R12 refrigerant. I think I would prefer to replace the the compressor and keep my cold plates. Is this feasible? If so what type/size compressor can I use. If not feasible what system should I consider for replacement. The freezer and frig are approx. 5 cu ft each. Any suggestions would be appreciated.