There is a post
here where a couple of individuals replaced the connectors on the 5000 series and were able to get a working matrix. If you have one which isn't working it may be worth trying (after making sure you have the correct connectors for that unit, obviously.)
But before replacing, I would give everything a thorough inspection and cleaning connections with contact cleaner to make sure it's not just a bit of corrosion somewhere.
What is prompting you to seek a new one? Not working? If so, to what extent? Missing completely?