The weak link with a Norco Accu Slide is usually the OEM installation. The pulleys pull loose from the sidewall due to lack of backing or over tightened/incorrect fasteners.
Good luck, depending on layout some can be a real bear to get at everything. May have to remove fascia trim.
Accu Slide Tech Docs
Too many geezers, self appointed moderators, experts, and disappearing posts for me. Enjoy. How many times can the same thing be rehashed over and over?