You're very welcome !
Here are 2 pictures, the first one shows the filter and medium/high amp board with the C556 transistor and capacitors circled in red, second one shows the low band amp with the capacitor and transistor that might be part of the muting circuit.
View attachment 121659
View attachment 121660
Yes please ask Genelec, as I mixed my experience (first card) and some observations from another forum where we tried to "reverse engineer" (not sure of the correct meaning) the low band amp board. I think it could help to have a confirmation from Genelec themself...
I'm in contact too with them about another trouble, they can't share schematics (as most of other brands) but they seems to be okay to help us individually.
Long story short, my 1038A are currently amped by Hypex FA503, so I have all the needed time to solve the trouble about my original Genelec amps, and that's my goal to achieve that.
Cheers mate
Peter (Pierre is my actual real name)