Welcome to the forum.
The CLD-91 is the Elite version of the CLD-3070.
A post from blam in another thread pretty much sums it up:
blam1 wrote:
The biggest issue I've found is the "grease" pioneer used for the loading gears and cams on the tray turn to virtual glue after time. Every 3070 I've resurrected required removing the entire assembly, cleaning and re-greasing.
If you haven't worked on a player before, tread carefully. The loading mechanism on these players is much more complex than later models.
What models are the other players?