Tech:W1800 selection problem...

Hi,

I disassembled, cleaned, and reassembled the selection mechanism of a
Wurlitzer 1800.

I obviously need a manual, but I was hoping for some advice before it
arrives...

If I select A1, the A1 pin will be activated. However, now there is a hum
from a relay (or something, I don't dare to let it hum long enough to find
out) in the junction box and if I press only the A key at this point A3 and
D3 will be selected and the hum will stop.

If I select A3, the A3 pin will be activated. Same hum, and when A is
pressed D3 is activated and hum goes away.

If I select D3 all is well (no hum) but each time I press D all relays are
activated (as to make a selection) but no selection is made. If I cycle
power, it goes away.

There must be at least one short, but where should I look?

If this kind of problem seems familiar, please let me know... : )

Best regards, Jonas