[Nobody]

Yes Joe, this is exactly my case and all you are saying I was told by my mechanic as well. I was thinking that my mechanic is no willing to do this very complicated job so I am just asking. If it is really motor it is no reason to take risk and remove window and all stuff around. For me it is always risky to touch roof window, especially in old cars. It takes a lot of time and money and result is without using proper parts questionable - it will leak.
On my spare car I have it, roof is touched by tree but sunroof or at least all its parts except cover is useable. I will wait for motor to die and than will do this job. Strange think is that it seems it is better working on battery power or going in higher revs. I let alternator to repas for prevent reasons (just change bearings and other stuff around) and we will see.
Petr