Hello,

     I got out the VOM meter and checked the connections.  There is a bad contact between the main board and the intermediate board, between the riser pin and the header socket (!!) which is not something I would have expected.

If I take out both boards and seat them together all the way (so that the pins bottom out in the header socket,) I can only "sort of" get a connection - it needs a little bit of pressure in some way to sit right.  I wonder if one of the contacts inside the header socket fell out.

So far I have not managed to get a connection with the two boards mounted inside the pedal enclosure so I have not been able to try and power it on.

If I can't figure out a good solution I may consider removing the riser and header socket, and replacing them by soldering in a ribbon cable.  Not sure if that would fit tho as it'd need a lot of slack in order to screw in/out the intermediate board.

P.S.  Are all of the intermediate boards hand-soldered?  The header socket was obviously hand soldered as I can see the pool of flux around the pins/pads.