Leaking tranny just redone on my w124. Took it to the shop and he replaced my pan & gasget with new one I bought and fixed my dipstick attaching at the top of trans. It was dry for a week but its now back to it's dripping again. Although doesn't seem to be coming from the gasket pan like last time but maybe where the dipstick tube goes into the tranny. I have a new MB O-Ring for it but wanted to know best way to fix this if it's still leaking out of there like it was last time. What are steps and any other culprit spots to check?