you have the display problem too, related to the 555 oscillator on the front pcb, there was some repairs about that issue changed the osc frequency if i recall
in theses you have at least 26 trimpots, you can check almost half or a little more with an dmm, before needing the right parts to do capacitance inductance calibrations
all repairs, SV manuals, calibrations procedures etc .. can be found on the web, bama archive and Ko4bb website
they are good beasts