I've done a few repairs now. It's fairly modular so easy to get at the boards. The only one where much unsoldering is involved is the Y-input attenuator and pre-amp module, there are about 7 wires I think to unsolder. Most of the rest are easy to move and get at the backs with a minimum of disconnection involved.
I've had to replace a couple of transistors in the Y pre-amp, 1 in the timebase, 1 in the calibrator, a decoupling cap in the timebase, a resistor in the HV end of the blanking circuit, something else around there I forget what, a resistor in series with the EHT lead since I fried it by putting the back cover on upside down, I also repaired a very old slide switch which had split it's contacts, repaired very old pot wiper which had broken for one of the channel's vertical position, took apart the beam finder switch because it was far too sensitive, and adjusted it's contacts.... Phew!
And now the EHT anode rubber cap has melted, I've been very kindly offered a replacement by another ETO member, taken from an old small monitor, so that should be ok.