Beverage Air UR30GE Won't Get Cold.

Question

I have turned the thermostat all the way cold. I have removed the cover and by-passed the thermostat. No luck.The evaporator and condenser fans are both running. The compressor is not kicking in consistently. I did hear it kick in after I moved it around and knocked on the relays around the compressor.Is there a replacement relay, sensor or capacitor on the compressor?A manual with schematics and exploded views would be helpful.