I have a Coke Vendo 39 with an original cooling system. We heard a buzzing coming from the machine and when I opened the door the fan next to the compressor was moving very slowly, then stopped completely. I unplugged the machine and let it cool. I added 3-in-1 oil to the fan valve and the bottom fan still doesn't work, but the top one is running and feels like it was cooling. What do you think the problem is and how can I fix it? Thanks, Now drinking warm pop Kevin G