I started working on fixing some seam rust today (the long horizontal
seam at the bottom of the driver's side) and found a small area (a
hole about 1/4 inch) that was rusted through.  Any suggestions?  I'm
going to remove the fridge to see if the problem came from an interior
water leak (I hope not!)

The seam is filled with some sort of rubber.  Is this the way it was done
at the factory?  If so, what should I use to replace it?

Bill