gp12smx preamp problems

[Chris1127]

Is anyone by any chance familiar with the insides of the gp12smx series preamps? My voltage selector got knocked to 115v getting packed away after my last gig and it blew when I plugged it in It took out all the 63v caps on the back board, which I've replaced; along with the varistor. It's working now but the compressor doesn't seem to work as it should (very little effect) and I'm getting a lot of hiss when I switch in the graphic - especially when i raise the 180- 660hz sliders. It's silent without the graphic switched in though. The cap on the graphic board looks a bit iffy so I'm going to swap that out but I wondered if anyone knew which IC(s) are in the compression circuit as that was going to be my next guess.

If anyone has any ideas how I might be able to contact Gavin who used to run GM Audio as well then I'd appreciate any suggestions.