Hi Urban Woman,
Unfortunately, your dispenser interface board
has gone to appliance parts heaven and needs to be replaced. Fortunately it's relatively cheap. If I recall correctly, all you have to do to access the dispenser board is use a small flat screwdriver. There are 2 locking "tabs"/slots on either side and underneath the board (you will barely be able to see it, they're just that small).
Of course you already know that you need to unplug the fridge before doing any repairs so I can skip that part.
Insert your screwdriver into those slots and pry the bottom of the board out. Then grasp it with your hands and remove it completely. There are three wire bundles on it, remove them and re-install them on the new board. Then simply snap the new board into place.
This should take maybe 15 minutes to do... super easy job.
p.s. Here's a link to the service manual
, but the removal of the dispenser board is not in it (everything else is, though, so it may come in handy later)
p.s.s. Since you're going to be unplugging the fridge for the repair, you ought to go to Home Depot and pick up one of these
to plug it back into. Transient voltage spikes are most likely the cause of all your woes... including the main board that was replaced.