So, my wifes school has the Spider Valve 112 Bogner (I have it now to play with)  and they just had the speaker (celestian classic g12) and input jack were replaced.  Now the only thing that works is the master volume possibly the presence too, no lights no effects no other knobs work.  Has anyone else had this?? and what could the possible causes be?   I don't want to crack this open yet, before I do a bit of research.

Is there a schematic or design document for the amp?

Thanks, I can use all the help I can get on this.

Pete