Product review (5 stars): I just fixed the leaking problem on a maytag mbf2258xeb3 ...
I just fixed the leaking problem on a maytag mbf2258xeb3 Fridge. After reading other reviews, I called Maytag prior to buying the part. Even though my fridge was 14 mos old they still are sending a tech to replace the duck bill check valve with this p-trap hose for no cost. I had already disassembled the freezer and fixed the ice block in the drain before realizing they fixed this for free.

This video talks you through the fix if you are frozen up:
http://www.youtube.com/watch?v=fea75FySAQ0

Alternately, you can just leave your fridge unplugged and freezer drawer open for a long time. Given the spot it freezes it will be at least overnight.

After cleaning out the clogged valve, if you use side cutters to cut a notch in the tip of the duck bill valve it will prevent a new clog until you can replace with the p-trap. Keep the notch small so humid air from the back of the fridge doesn't leak into the freezer and cause the very ice clog you are trying to avoid.

Hope that helps!