550 Passenger window issue

My passenger door window on my 2000, 550 started to mess up this weekend. I've noticed a little wind noise recently when it's closed, so it clearly wasn't seating correctly, but this was minimal. Then yesterday, I rolled it down all the way and for the first time it made some nasty noises when it reached the fully opened position and the glass jumped around a bit. The window continues to work Ok, and I was able to power it back to the closed position ... but it clearly has issues. Possibly a plastic roller or loose track. I plan to pull the door panel and take a closer look .. but before doing so ... thought I'd ask if anyone else has experienced this issue. I have all the hardcopy factory service manuals with exploded views ...... but also wonder if anyone has experience with this and can offer some tips .... things I should be extra careful about ... like door panel clips that tend to break unless you pull them in exactly the right manner, etc, etc. Any advise would be helpful. I've pulled many a door panel ... but never one on my 550.

Thanks,