I have a 1980's Pepsi machine and the compressor was replaced a few years ago with I believe a R-134A but I don't know for sure cause I have only owned it for 8 months. The compressor yesterday stopped running. I can hear all fans running but the compressor will start up for about 4 seconds and then stop and will try again every so often. Does this sound like it is just in need of freon or is it a bigger problem? I am not very knowledgeable in the mechanics of a compressor so sorry if my lingo is off.