I just Bought a Mark II C Combo Hardwood, Simul class, reverb, Graphic, all original with Road case all paper work and 1 owner receipt cords and switches Find of a life time. Now couple questions what is it worth the way it is and should I send it to MB for the plus upgrade and what would it be worth then. I am torn playing boogie since 79 I'm stumped really need your help guys. THANKS !!