Click, bump, boomp.....when I close my door???

[RickM]

All of a sudden my driver's side door makes a series of three irritating sounds when I close it. It appears that the notched piece that keeps the door open in the two preset positions and whatever it intefaces with are the culprits. When I take the door panel off what should I expect to see in there? What does the notched "door positoner" come in contact with?

I'd like to know how to prepare for the project.

Thanks.