I have a 2 year old BRF 2004R built by Eric Schertz. Since I've had the transmission there has been a slow leak from the pan that would come and go. Now it is always leaking. It's not a huge amount, but enough to want to fix. After I drive the car around and leave sit overnight there is about a 6 inch diameter spot of soaked pavement (not an actual puddle). I've torqued and retorqued, but that didn't make a difference. The gasket that is in there is one of the rubber types. Should I try a cork gasket? Any suggestions?