i appreciate your virtuous offer, but packing and sending the cdp from boston to arizona would b, as you can imagine, a big deal. i just wanted a quick and trusted fix; so i had the piano repaired by a trusted perdon: cleaned optics and rebuilt the spindle and sled motors. works like a charm. repair guy was impressed by the piano (not unexpected)
seth, cami and jason, have a fine holiday and new year.
john from boston