I have been monitoring this for a while now and I was hoping it was just residual from oil changes but I don't think it is. It appears to be leaking from the nut on the bottom of the rack but I'm not 100% sure. I have been cleaning it and hoping for the best but it doesn't look to be good. Is this a normal spot for it to leak? Is it fixable or does it have to be replaced? I don't see any lines leaking but that doesn't mean there isn't one. It doesn't leave drops on the garage floor. What are some good indications of a rack and pinion failure besides the obvious leak?