Re: Rear Seal and others issues
Jim, your dealer probably spotted engine oil seeping from the area where you clutch housing and engine attach. If that's the case, it's a valid assumption that the rear main seal is leaking. Were it mine (and I just went through this last spring), I would clean the area up, take it out for a spin, and verify that it is in fact leaking, and that it is in fact engine oil. There are other components that can leak in that area, but bottom line, if one is gone, you'll likely want to replace them all.
I did my clutch, both pressure plates, slave valve, all seals and rebuilt my final drive for $1,000. I do have a lift, but made my own specialty tools. I'm not a mechanic or a machinist, and the job was pretty straight forward and enjoyable.
Good luck to ya.