...and this is the side you haven't. As well as the burned area  located at centre top (counterpart of the one we’ve seen on the other side), notice another discoloured area just to the right of the big black capacitor on the right of centre. Clearly, components in this area have been running hot, too.

I'm delighted to say that when contacted, Conrad-Johnson were extremely helpful with information, because I really wouldn't have liked to have to reverse-engineer this bloody lot, especially when a lot of the component designations are missing or far too small to read even with a magnifying glass.