Hello George,
I replaced my screen door last year. It was not all that difficult to take the door off. If I can find the instructions I will post here. The top and bottom end caps removed will give you access to the roller. Finding the replacement screen locally was a pain. Most custom glass shops can provide it..
With the screen door off I was able to clean and paint below the channels that just snap off.
I was almost tempted to replace it with a hinged door.
Bill G
