I got a call today from a location that the drink machine was vending warm cans. I had just been there yesterday to fix their validator. I showed up and the coils under the delivery chute (sorry cant remember if thats the evaporator or the condensor) were completely iced over. The compressor and fan appeared to be running fine, everything worked 100% as of yesterday. I am thinking i did not tighten the door enough when i left. I turned off the cooling system however I'm not sure what to do n