Thanks for the advise! I have a Door Lock Repair Kit on order from Bavarian Autosport ($12.95). Hopefully that will do the trick. I'll will follow up once I have that repair completed.

It's interesting that the guy at the dealership didn't seem that interested in the broken door lock cylinder. I said that I thought it could be related given the sequence of events that occurred and the timing... I even had him try out the door lock himself but he wasn't too impressed with my theories. He just made me an appointment for a $200 Diagnostic and Evaluation service.