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Mike Coon[_2_]

In article , says...

Normally I would go around with a can of freezy spray and dob various
parts of the board looking for the fault to go away, but sadly in this
case it's not possible as the board in question is one of these slot-in
types that are inaccessible to investigation when the instrument is under
power.

Decades ago there was always a standard extension board that plugged
into the motherboard in place of the questionable one and carried only a
socket that the one under investigation could be plugged into to make it
accessible, so long as the covers were off...

Mike.