MOTM

Hello @all, ( might be my first post here )

I have populated 4x Motm300 PCBs.
Two Modules were built in motm Format with onboard Pots, 
and those are running fine, no Issues.

Then i built the third one in euroformat and this one makes nothing, it's dead,
exept that it makes noises, especially when i turn the coarse pot.


all Boards were populated in parallel, there should really be no fault,
so my first assumption is that i have a bad part.
The Styroflex Cap in the core i replaced allready. It's still the same.
Power i measured on the IC sockets on all Boards together bevore i puted in the ICs as far i remember ( they were stuffed 5-6 month ago )

Hope to get some advice for debugging / measurings.
thanks