Sorry -- I meant that the ext. warranty period was incorrectly entered from Sept. 2012 to Sept. 2013 (not 2011 to 2012). Either way, it was wrong. Extended warranty coverage should have been through the end of May 2014.
At this point you only have one option: call whirlpool's 800 number and state your case.
If you have other whirlpool products write down the model and serial numbers (before you call) of all them so you can demonstrate your loyalty to them.
Mention previous repairs during the warranty period, and don't take "no" for an answer. Ask for a supervisor if they wont help you and don't loose your temper (easier said than done).
Good luck and please let us know the outcome!