Big thanks to Daniel for not only coming over to help unload (and frankly we were stuffed from the drive to Bendigo and back, so Daniel did most of the hard bits) but also offering those legs.

Been playing around with the no sound problem tonight, eliminated everything down to the sound power board. With everything on that 24v disconnected, the fuse goes with the power board just connected (tested good board), so I think it's a short in amongst its lines somewhere.