That extra socket is only for the control of the auto leveling feature. It sounds like to me you just have dirty electrical contacts and need to clean the contacts in the sockets. They make a spray that is used to clean electrical contacts, last time I purchased a can I got it at my local auto parts store, can remember what they called the spray, just ask them. Maybe a small tooth brush could be used to clean contacts, its just hard to get into those small holes. Try the spray....even WD-40 may work for you. That's where I would start.
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