Nope, an auto electrician cannot fix it.
If you are sure it is not a wiring problem, then this guy in the UK repairs them quiet cheaply and can upgrade the amps (my whole unit died nearly a year ago and I bought an upgraded module from him). His email address is
[email protected] and his name is Baris. He might be able to help without you sending the unit to him.
As X5SND suggested, for region specific questions, best to use the
Australia Forum - Xoutpost.com forum.