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What are we working with here? "Model 323" doesn't tell me enough.
Are you sure about the model number? It should have 4 numbers after "RM" and once I know this I can grab a manual and direct you further.
That is the part number off the door............look on the inside of the fridge for the data tag. Or it may be on the rear lower left hand corner once you open up that door. Once I know what you have I can get you the proper manual and direct you further to resolve this.
Since you didn't give me the data on the model of the fridge I guess you will have to call in a mobile tech or take it to a shop. I told you where to find that information so not much else I can do for you here.
The only fridge that can be a 323 model is an older Norcold model. Dometic never made one. Is this the problem?
And that serial number looks a lot like a Norcold number..........clarify this for me and I can help you.