Do you mean the JP-2C, the John Petrucci signature re-release of the Mesa Mark IIC+? Because I can't find anything for RP-9C or RP-2C.
If so, the Mark IIB is a very different amp. Even the Mark IIC is quite different. The IIC+ schematic should roughly trace the EQ and gain paths of Channel 2 and 3 of the JP-2C, with the most obvious differences being the Volume control was deleted in favor of Push-Pull toggles between two levels, and most of the DEEP/SHIFT controls were deleted as well. Also, obviously, the JP-2C has that lead channel duplicated twice, a second GEQ, a different clean channel, Shred mode, Midi, and more as well.
There's no JP-2C schematic out there to my knowledge.