refurbise isotherm fridge any advice ?

[xxhat]

going refurbise an existing old isotherm water cooled fridge with an identical Isotherm 2554.


Has a water thru hull which cools the fridge.


Any advice on refurbising it ?


I plan to


1. Change compressor and controller


2. Add zinc to existing thru hull. Existing hull has a section broken off but as boat is in water I do not see any way to replace thru hull with water in water.


3. Using existing evaporator and piping.


Thanks for any advice,


jim