ive got a derby glass top freezer i was looking at today, standing pressure is at about 2.5barg R134a. Another company have looked at it previously as the customer uses it at Famres Markets and have attatched a line tap valve on the suction. When i turn it on the back pressure comes down to about 1.5barg but im getting no temp on the discharge pipe. When i took of the condenser fan blade the top of the condenser is only luke warm. The inside of the chest freezer is cold around the top and temp inside the cabinet is at about 7 degrees. I recovered 300g of refrigerant which is the ammount on the manufacturers label, evacuated from the suction and recharged with the same ammount but is still doing the same... am i right in thinking i have a restriction in the high side or is this more than likely a fault with the compressor.. This was one of them **** jobs on a Friday......The other company that looked at this cabinet said it was the compressor but im not sure...Thankyou for your help.