Korg DW8000, Mono/Poly, MS-20...

please bear with the off topic post. i've run out of options and i've 
gotten good help here with my 8000, so i figure i may as well ask.
my newly acquired sbx-10 has a tempo problem. when i got it, one of
the pads(for the tempo knob) on the pcb was lifted. i desoldered,
scraped away some of the trace and resoldered, plus i soldered a short
piece of wire from the terminal to the next contact down the line,
just to be sure. still nothing. i brought it to a tech who tested it
and said the pot itself was fine. so the problem is somewhere else.
the tap button works, so i know the tempo function is working, but
there's a problem somewhere between it and the knob. any thoughts?
does anyone have a service manual? i've found a couple sites that have 
one for sale, but have not received a response.
thanks,
shayne 




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