Kitchen Aid D/W has very long cycles

Dishwasher Repair
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[RIGHT]Model Number: KUDIO1ILBL2 Brand: Kitchen Aid Age: 1 - 5 years [/RIGHT]

    My Kitchen Aid dishwasher runs in the wash cycle  for a very long time before moving into the dry cycle.  I have tried to heat the  water in the sink just before starting but this hasnt made a difference.  I am  assuming this is a thermostat issue.  Can you confirm that is the problem or  suggest another source for this issue? Please state the needed part and corrrect  part number for this model in your reponse if possible as I do not want to go  fishing here; would rather order the correct part(s) and be done with it.

Thanks for your help!!
GN