TECH: NSM Silver Sky & Performer Grand Title Page Rebuilding?

Hi,
I have a Silver Sky and Performer Grand and am having MAJOR title page unit
problems!

I have completely disassembled the units, cleaned thorougly everything,
replaced the pages, ensured all title cards and 1 sheet thick. WOrks great
for a while, then starts going really slow, then jamming. Does anyone have
any advice on these units? Or any locations of rebuild kits?

Could the motors actually just weakenign over time?

Any advice would be most appreciated! I'm sure I'm not the only one having
this problem!

Thanks!