As I recall from when our coach was brand new and the cover failed, BCS accessed the mechanism via a floor panel to the right of the drivers seat. You may have to hunt through floor covering for that. If you have a diesel Santiam, then I’d guess like ours your cover is air driven.
The air line may be compromised or the air solenoid either electrically or aerobically faulty. The “click” you hear implies the solenoid is getting power and activating, but either air isn’t getting through or something in the track(s) is blocking cover movement. It can also be a loose fastener anywhere from the cover’s framework to the ram mounting, resulting in misalignment that jams the cover.
Joel