I posted the test message, after my original message posting failed but with no error message from the forum (turns out due attachments being too big).
After posting worked, I tried to delete the post 'test', it wouldn't let me, it seems to be gone now.
Expecting nothing, after I replaced pots, everything fine (excellent value).
Just uploaded schematic because it doesn't exist online and others may find it useful.
Here are pics of the control board and a failed pot.
tristate