getting red fluid in the bottom of the pan - maybe a half quart in 10 hours. Don't think it is transmission fluid since it seems at level over several days of this. Assume it is red diesel. I can't find the leak though. If I look under the pan with a mirror, it is dripping right over the oil pan plug in the back. Fuel pump, injectors and fuel filter are all dry. Can't access the back.

I read on some board that their is the fuel return that snakes back there, but I have the service manual and I don't see any diesel carrying tube to the back of the engine. Any thoughts appreciated.