I have an Aria Sinsonido electric bass guitar. It's a real rare beauty, headless, fretless and body less (yes, really) and as far as I know it is one of only a few hundred made and I had it specially imported so may be one of very few in UK
Sadly it's having problems with the electrics, the tone control for the active pickup doesn't work and is stuck on clangu rather than the smooth soft near sinusoidal sound I love in a bass. Being so rare though the local repair shop has no clue where to start, and I don't know where to get support. I'm hoping that if I can find the circuit diagram or a specialist and see if I can replace the damaged part (if it's just the vari cap) or even (gulp) try and get a whole new PCB made for it locally
This is a unique bass and while probably not the greatest in truth, it's been with me in hundreds of concerts in my youth and it's practically a horcrux by now!