Welcome to the group! As to the +8.5/-6.5 supplies, I’ve always found the problem to be a semi or hard short, usually one of the caps on the TSB boards. It’s possible it’s the op-amp or transistors in the PS, but I haven’t run across that. As to where TR9 and 14 are hiding - they’re on the heatsinks, not on the PCB. I can’t remember right now whether they’re the big TO3 transistors or (I think more likely) the TO220 transistors. If the latter, they’re a massive pain to get to!!!
Good luck and let us know what you find.
David