I normally "live" on the Solar System imaging forum

but I have an issue with my stock 12" Skywatcher Goto Dobsonian that I have used extensively for planet imaging with a Canon EOS 600D, and I am seeking some advice
Ever since I attempted repair of the 12V DC power socket which broke off the main circuit board after being knocked, the altitude motor will not change speed - preferring instead to operate at high speed with no dampening, no matter what the controller speed is set to (ie 1 to 9). The azimuth control/motor works fine. The telescope will neither automatically track correctly nor will it let me do fine altitude control.
The altitude control worked fine after the bump so I think I have stuffed up the circuit board somewhere (probably short circuited).
I am looking at two options - either obtain a replacement board or send the telescope or part in for repair.
Does anyone here have experience in getting parts like this, or have a favoured repair place based in Brisbane?
Cheers,
Tom