My 1990 Pearson 34-2 came with an Alder Barbour Cold Machine (probably installed 1990) when purchased in 2000. This season it failed. I am told that the compressor is frozen. The power supply tests OK. One refrig repairman advised to replace the compressor, power supply and refigerant. A-D advises to replace eveything with a new unit. This would require re-running all the refrigerent lines from the compressor to the frig. Your advice? Should I consider something other than an A-B? Thanks.