The NR751 from Norcold should be the direct replacement. They run about $1,000 in black and about $1300 in SS, not counting for tax and any shipping.
You could simply try an HVAC and refrigeration person. We had the same problem and it simply needed to be recharged. Fortunately for us, the charge held for the next few years , then we sold that boat. You may get lucky and just need a recharge. If it works, then gets progressively worse over time again, then its time to replace.
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