I've got a Rivage cab on a J plate so it is mk1 shape but it is the same era as the mk2 and in the handbook it says that the MFA displays temps from 50c - 160c, it also says that if the temp is 145c then you should slow the engine speed down so I guess 104c is normal and well within its limit.
As an aside, don't be beating her until the engine temp is 50c, apologies if you already know this
