Often a wine cooler is replaced because of a noise problem. Often a $10 fix
The Cuisinart - Private Reserve 16-Bottle Wine Cellar often is replaced because the cooling fan becomes noisy.
The original fan has a sleeved bearing (which becomes noisy as the lubrication wears out) and you can replace this fan with a ball bearing fan for around $10
The replacement 12 VDC fan may have an additional wire (yellow) but it is not needed, just splice in the red and black wires to the original connector.
To access the fan - unplug the unit. Remove the rear cover with a #2 phillips screw driver. Once the cover is off you will see the fan and it is held on by 4 small screws and nuts. The electrical connector location on the circuit board is labeled "fan". Carefully unplug the connector and remove the fan.