Ok... another update.
I've scraped off the solder mask over that via that leads to C8 very delicately, and tried to solder a wire to it. bad idea - the wire wouldn't stay in place as the solder was heating up . Long story short, I ripped out the top of the via connected to C8 + by accident. Can anyone tell me where it leads, so I can manually connect it please?
EDITI've now also lost C4's negative lead...
is there any hope?