We have a 2015 S680 that has never had an option in the calibration drop-down menu for reel position.  It is also grayed out on the AUTO page for the header.  Is there a possibility that someone changed an address at some point so that it didn't show up?  It has been this way on a 640FD and FD140.  It does give a code at startup indicating reel position isn't calibrated but gives no options to actually do it.  Would anyone know the address or a trick to get it to allow calibration?