McIntosh MVP851 - origin of transport

I recently acquired both a McIntosh MVP831 and an MVP851 and they sound excellent. The 831 obviously has a Panasonic DVD-A110U/CA transport - which is fine. The 851 is reported to have a newer version of a Panasonic transport - but it sure does not look like a Panasonic. It was built in 2002. It appears to be made from some high-tech polymer and has a disc clamp that is a translucent honeycomb material and covers the entire disc. Could this be a Denon? Does anyone know the model number?
I can't be 100% sure on the model, but it is a Denon transport, but I think it is the same as used in the 3910. Possibly a 5910.
Hope that helps
Thanks, Theo - yes that helps!
By any chance might you know whether the MVP841 (that's 841) has the 831's transport or the 851's transport or something else?