I just took mine in for what we thought was the rear main seal. There was oil visible directly behind the oil pan (I can send photos if you want). It actually ended up being the rear of the oil pan. Thinking it was the RMS, they dropped the transmission to get to it, and it took the dealership almost a week to complete the work. They removed the skids, torsion bars, crossmembers, etc. Sounds like more than a mod day project.