HELP Isotherm 2554 and 2556 fridge

[xxhat]

hi,

I have an isotherm 2554 fridge and have some questions

1. Difference between the 2554 and 2556 is just capacity ?

2. Is it possible to source the compressor unit from somewhere else other than Isotherm ?

3. Not really keen on the truhull cooling. Without the zinc I worry it will become brittle and break off. Do I need to worry ?

Bottom line is my 2554 unit is very old and does not work. Right now I am thinking of upgrading to the 2556 unless I miss something or I can just replace the trullhull and compressor.

Thanks !!!!!

jim