Tony, I'm
a module swapper because that's what I know, and usually the
Well, if you want to swap modules, then replace the analogue board, which
is where the fault almost certainly is :-)
This is a case where I think the board level repair is really called for.
In fact I recommend that people replace ALL of the known failure mode parts
with better quality modern units, clean up all the known poor solder joints
etc., and service the floppy drive.
Do the job once, do it right, and never have to worry about it again.