Hello, I just recently purchased this laundromat and it has two vending machines in it. The pop vending machine isn't keeping anything cold today, the motor or compressor not sure of the right terminalogy started making a noise yesterday and I unplugged it, thinking maybe it would reset itself? but I pugged it in today and it is still making it. What can I do to trouble shoot what it may be before I call for service? Need help ASAP!!!