Can't comment on 15/16, but have R&R on 4, 9, and 10. #10 is a bit of a PITA due to needing to lever the ball-socket end off of #9. IMO if you're in that far may be a good idea to pop open the roof gearboxes and make sure the plastic gear inside is in good shape. Protip: When removing the gearboxes, watch. your. hands. Still have a scar from when my hand slipped and a little metal protrusion bit me.
