I have a leak at where the pressure control cable or bowden line connects into the 722.3 W4A-040 transmission at RH side center of casing on 1986 560SEL. It looks to have a tan plastic lock tab and I do not want to break it by not knowing how to proceed. To disconnect and get to replace an O ring do I rotate and pull up or what. If so what is rotation direction and by how many degrees from cable end perspective? Any other caveats? I would hope this is not going to internally disconnect the actual line, is that correct?