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Call another company....even look in your phone book for a smaller HVAC Company. Many of them will do refrigerators also...
134a should not be a porblem, they either did not want to do it or did not know how to do it...
Some of this TRUE don't have service valves, but you can put a tapping valve (A1) in the appendix (small piece of pipe comming out of the compresor and seal on the other end).To check the pressure you need to know what type of refrigerant is in the system .If is 134a the low side should be about 24psi and the high around 160 it could vary depends how hot is inside the place and the fridge but not much more than 200.If you working with R22 pressures be around 60 low and 250 high side.
Defrost system problem. Could be in heaters, defrost thermostat, or defrost timing circuit. Freezing in vegetable section is due to air back flow related to frozen evaporator coil in freezer compartment. Colder air settles and warmer air raises.
Ice maker problem is separate. Bar up engages micro switch that is supposed to shut it off. Bad micro-switch?
Low freon charge will cause the compressor to run continuously, as it never reaches the set temperature. This will also cause excessive ice buildup as well. I am assuming this little fridge doesn't have an automatic defrost. If it does look at that next. Youdidn't say, but does it reach proper temperature? Go to the back where the compressor is. Feel the lines coming out of the compressor. the low pressure, or larger one, it may have insulation around it, should be cold. If you cant tell (sometimes these small compressors they look the same size) its the line leading inside the freezer. Feel about 1 foot away from the compressor, if possible. Next feel the high or small pipe, this one is going to the outside coil. This should be very warm, but not cool and not real hot. This goes for the compressor too. A 134A system sometimes is very hot when low on freon.
get a pericing valve from your local appliance parts store 25 inch and put it on the small little what i like to call pig tail make sure your pluged up and running when you do this .go get a can of 134a from autoparts store best one is advance autoparts get a car ac switch over kit from r12 to 134a and in it will be a fitting that will fit your pircing valve then read instructions from their .GOOD LUCK !!!!