It sounds like one of the fans is losing a bearing (or more likely sleeve - few of these fans are actually ball bearing based).
If it's like my Norcold, the fans are fairly standard 24V 120mm fans (not 12V as you might expect - the fridge power supply accepts either 120VAC, 240VAC, 12VDC, or 24VDC and makes 24VDC for the system to run on). Open it up and look at the fans -they should have the specs printed on them. Go to Digikey (digikey.com), Mouser (mouser.com), or some other place and order a new fan. As a temporary work-around, if you remove the label on the fan, there should be a small rubber plug that you can remove to gain access to the bearing - put a couple of drops of sewing machine oil (in a pinch: get a drop of automatic transmission fluid from the steering dipstick) - DO NOT UNDER ANY CIRCUMSTANCES USE WD-40. It is NOT a lubricant, it is a water displacing cleaning agent and will REMOVE what little lubrication there is on the bearing - it will run for a few days then die. Put the plug back in and you should be able to run for a few months - enough to order a new fan.
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