Anyone able to tell me what a lever may be for? Stumbled on one I did not know existed until I was underneath greasing some fittings. We have the grey and black pull levers in a docking station, but when doing some maintenance I discoverd a third pull lever under the trailer on the kitchen side that is not easily seen or accesible. Is this somehow related to the gray tank for the kitchen? If so what is the proper position for it? Thanks in advance