MoogerFooger MF-102 switch weirdness

[funkyfarm]

Hi,

my moog ringmodulator felt down on the floor (because on my stunting cat...).
It made a short pleasant sound.
But now the main switch is "glitchy" (flip-flop between bypass and active...) ; some bounce occurs.

So I've bought another switch at Smallbear

Momentary SPST "Soft-Touch"
Rugged enough to be stomped. Normally Open, short, light stroke, with positive action.

It did not change anything.
Press Bypass, it bypasses for half a second and return in active mode.
on the third or forth try , it operates right...

So I look at the pcb :

This Bypass switch briefly connects +5v to a pin of a CD40xx.
So i've swapped it for a new one with no success.
I've also changed both 100nF capacitor lying around around this 5volts triggering (not decouplling ones)...

The whole pcb (amp, ringmod, carrier vco, mixer, vc lfo...) is full of LM13700, that's sure, but i can't figure out which IC could be wrong for bypass...for sure a semiconductor is involved here ?

this pedal sound fantastic, really.
devilish animal...

[RF]

[doctorvague]

[funkyfarm]

thank you very much for reading.

i'll get a magnifying glass and check.

[funkyfarm]

argh...don't find anything...

thank you.

(i was about to sell this wonderful module because of money ; i'll keep it, and always in ACTIVE mode ! )