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I believe I have the relevant manual in .pdf form, it is just not the clearest reproduction.

Just to help fill in more details, with no power to the scope, the resistance readings across the various low voltage rails are as follows;

140v ... 24 KΩ
65V ... 7.3 Ω
15v ... 13.7 Ω
5v ... 0.2 Ω
-8v ... 47.4Ω
-15v .. 2.5 Ω

So connected the scope up at 100mA but nothing heated up.

When you say to test on the other side of the 'pass' transistor, are they the ones bolted under the bar at the rear of the scope? And when you say disconnect everything from the supply, are you talking about disconnecting the boards beyond the main A6 board?