The service advisor said that my ptu was leaking onto the exhaust pipe also. I physically noticed that the gear oil leaked onto the frame of the vehicle and saturated the rear engine/transmission mount to the point that it also needed replaced under the warranty.
MY 2013 Lincoln Mks only had 35,000 miles on it when the ptu started leaking fluid. I purchased it with only 32,000 miles. Thank god it was still under warranty. Now that a new ptu was supposedly installed by a local Ford dealer in my area, the exhaust seems to be louder under the drivers seat than it was before the repair. I guess that is what happens when they have to remove the whole exhaust including the exhaust manifold. Also after a few months, I also notice that the front wheels have a wash board ride to them starting at 45 mph and they really rumble at 65 to 70 mph. The vehicle was a certified Lincoln with brand new tires. A week after the repair, I took it back to the dealership to have it checked for the louder exhaust issue and they had the technician who repaired it to go over it again. I feel that it should have been evaluated by a fresh set of eyes. I now have an appointment with the dealership that I originally purchased it from 1 year ago. I will let the technician drive the vehicle while i am in the passenger seat. I will update everyone with the results.