[Arran]

More often then not you can gain access to the capacitors and resistors mounted above the pushbutton assembly without removing the assembly. In some cases you can remove just enough wires to allow you to loosen the assembly and flip it out of the way. I will have to examine the circuit to see if any of the capacitors in that section may cause a catastrophic failure, like a bypass capacitor between a plate or screen grid and ground.
Regards
Arran