The discretes I use for my RP91 that I downloaded from the Pronto section of Remote Central have worked for the RP82, RP56, and RV31. I can't recall if the discretes were for the 91 or one of the other players, but they seem interoperable.
The "other" Panasonic codes mentioned above ought to work, but if they don't-
I know for a fact that Denon DVD-2500 (player was Panasonic A120 based) discrete codes work. I recently upgraded from the DVD-2500 to the RP-91, and I didn't have to reprogram my Pronto for any of the codes.
If you are still stuck, email me, and I'll send you my .ccf.
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