Perfect. Check each secondary to the center tap (black wire) - IE One probe on a blue wire and the other on the black. Check for continuity and also measure the resistance. It would be best to unsolder the switch to check the primaries - Those you can just put the probes onto both wires as there is no center tap. If they are all good, we can move onto reassembly and taking voltage measurements.

It would be great to try to get a schematic to help troubleshoot - I had a quick search on the net but couldn't find one for that model. The other thing is to check the indicator light bulb - that may be buggered and there is actually HV present off the transformer with the problem lying downstream.