Ironically that was partly why I bought it, I'm trying to improve the diagnosis and fault finding skills, made more challenging when detailed circuit information is scarce to non existent. I always find myself watching others doing diagnosis such as Dave or 'Mr Carlson' with a sense of 'I wish I could do that', I therefore take on little projects, this is such a project.
I'm no expert, not really touched electronics in 30+ years - it used to be a hobby even then so it could take a while.