Very very noisy dooe side slide

[stanleyz]

2005 36 TK3 Just wondering if anyone else had dealt with this problem and how they resolved it. The door side slide works very well but it is making a loud racket both in and out. Sounds like rusty metal against rusty metal or possibly a bearing going bad. I've tried lubrication of the parts that can be reached without opening anything up. Tried Silicon, then WD 40, then oil. Had no impact with any of them.

Questions, who has had a similar problem and solved it? How? What is the best access, through the bottom of the slide or up through the dirt shield? I have an advanced degree in "shade tree mechanics" but is this a job best left to the pros?