Please put your pickup/wiring discussions in the Electronics section; and put discussions about repair issues, including "disappearing" errors in new instruments, in the Repairs section.
The pickups are Aguilar J70s, the preamp is Glockenklang. Knobs in active are volume, balance, treble, mid, bass (boost/cut), and in passive (push/pull volume) the treble functions as a low pass tone. The bolts on the back hold inserts in the front for access to the truss rod and for a detachable ramp between the pickups. I'll show that better in some nicer pictures than these Thanks for your replies!