U-Line no longer cooling

https://manualsdump.com/en/manuals/avanti-wc1500dss/66172/12
The above has a troubleshooting matrix.

Power supply: Check if the wine fridge is receiving power from the mains supply. If it's not, there might be a major issue with the mains power or the PSU circuit board in the product that'll likely need replacing if it's faulty.
Condenser fan: The condenser fan is designed to cool the condenser and condenser coil within the Avanti wine cooler. If it doesn't function, the condenser and coil can overheat - causing the internal area of the wine fridge to heat up too. Take a look at the rear of the unit and make sure the condenser fan is spinning freely and not blocked (by dust / dirt) or making excessive noise due debris or a blockage.
Thermostat: If the Avanti wine fridge thermostat is working correctly, it's responsible for making the condenser, evaporator, fan, and compressor work - so it's super important! The thermostat also allows you to control and adjust the temperature of the wine cooler so if the reading on thermostat is inaccurate (or flat out wrong) the wine cooler temperature will likely be inaccurate too.

Why Is My Avanti Wine Fridge Not Cooling (And How To Fix It) - Expert Wine Storage

More than likely it is the temp control (thermostat) it is what controls the on and off

sounds like a dirty condenser the compressor will overheat and not turn back on until cooled off

Turn it off and place a small electric fan by compressor to cool it down.
When you turn it back on, see if you hear a clicking noise. This would indicate starting components need checking.

check thermostat

if suction line is warm and pressure line hot . sounds like comp is trying to do its job / ck the fans and they may be slow or not going . spilling of the wine did not cause problem . .. but now is the time to correct the problem .. mm / ps if unit is running like you state the you might look at the ref charge . as it may be low . mm . hope this hs helped . feed back pls .. mm

I believe the 6SBAR has an evaporator fan located behind the evaporator plate ( the cooling plate) inside the unit. They had some issues with the bearings in those fans failing and will sound like a small jet engine sometimes (high pitched whine). When you hear the noise, open the door and if the noise level changes (either gets louder or goes away) then it is the evaporator fan. If your noise is coming from the compressor area and does not change when you open the door, it is most likely the condenser fan blade is loose. The evaporator fan looks like a small computer cooling fan and is located near the bottom center of the evaporator plate (out of site). The factory sells a replacement kit with a much better fan and new power supply. You can reach them at 800-223-3900. Good-luck.

If nothing is running and the lights are on then you need to replace the conntrol. You can visit U-line website to find out where to purchase the part, www.u-line.com and under customer service you will see parts locator.

If your condensor fan is running and the compressor is running then you will need a tech to look at the sealed system for you.

First question is, are there any fans that are built in that are not running? next is there may be no freon in the unit. Ive seen new stuff from the factory have no freon inside. feel the suction line (the bigger one) from the compressor. It should be cool. The discharge line (smal one) should be hot.