Didnt know there was a name for it.
Yes I have a esr meter, and it does in circuit, and I have tested all the caps, 3 4u7 150v caps were slightly high and have been replaced, it didnt make much difference the scope still didnt trigger, only when I soldered the 2nd and 3rd stage trigger amp trannys in did the scope start to trigger properly (they were in sockets), theres still 2 or 3 ranges where the scope will trigger ok for a second then bomb out, making me think dodgy cap or range switch contacts, the trigger amp looks like it has variable bandwidth controlled by the range sw.
I've no intention of binning it, and it wouldnt be worth selling, its been usefull for odd jobs and is permanently connected up to my component tester gizmo. I have a biccy tin half full of salvaged high voltage psu caps so I'll replace the 3 main supply caps, didnt want to 'scope the ripple on them, messsing about with 200v signals isnt something I want to do with my good 'scope, thats what this one was for!