I managed to get both tracks removed. With the caps removed there are three screws holding them to the frame. Top screw came out no problem, bottom screws were badly rusted and frozen, not even a screw extractor wold remove them, so I drilled them out.
On the housing, the top cap screw has nut on the end, located inside between the frame and the padded shroud, just enough room to get a box wrench in there. The bottom cap screw is rusted like the tracks were, I can not tell right now if it has a nut on it, it was getting dark and I tried finding it by searching up behind the step, That will be my first thing to do this morning. I will be careful once I remove the bolt, according to the diagram provided by Holly this contains the spring.
This job so far taught me a hard lesson. Monthly or at least twice a year this system needs attention. The build up of debris between the track and door frame was amazing.
So, today I can clean, sand and paint.
Bill G