Bingo,
I posted on this back in June/July but can't seem to find it now. Thanks to JimF I fixed our leak. Here is what was happening.
If you take the outside vent cover off of the refrigerator (TOP and BOTTOM COVER) and take a look at the plastic frame that the cover attaches to. At the bottom, when they inserted screws it pulls the inside of the frame downward so any water coming down around the sides or any place has no place to drain to the outside so it finds the path of least resistance nad get under the back lip of the frame. What we did to fix it was:
Go to a hardware store and pick up a 48" piece of 1/2 inch aluminum angle iron. Measure the lenght of the bottom lip. Mine was 21 inches, and cut the aluminum to fit. Take out the bottom screws holding the plastic frame in and the first screw up on each side from the bottom. Place one edge of the angle iron under the inside lip and set it in place. Replace the screws you took out. You may notice that they are rusty. this is from the water seeping down. I used silicone calk in each screw hole before replacing the screws. On the right angle of the angle iron, and against the lip it is sitting under, place a good bead of silicon calk. At the ends where the angle iron ends, build a dam of silicon.
Walk away happy!
The next rain we had after that did not show any water in the kitchen on the 3400RL. Before that, we had wet carpet between the stove and the refrigerator. We pulled everything out and put a fan blowing in to dry the carpet before the next rain storm. Never had any more leaks and carpet is staying dry.
Here is the 21 inch aluminum angle iron:
Here is one of the finished pictures with silicone in place:
Here are the rusty wood screws:
Here are the two refer vents on the 3400RL:
It's an easy job.
Good luck.