I was out for a ride yesterday and about 10 miles from home i started to feel a strange vibration from the drive train. It seemed more pronounced during deceleration. When I got home the FD was really hot. I also had heavy oil residue on the tire and around the brake caliper (which is mounted on the low side of the wheel...this is German engineering???). I slowly removed the drain/filler plug and got the unpleasant surprise of a hot oil bath (I was expecting there to be little to no oil in the unit). I replace the FD oil about 4k miles ago and have had no problems.... until yesterday! Any ideas on what happened and where I go from here?? Thanks for any troubleshooting or diagnostic tips.