Dishwasher broken

[cosmo20002]

My dishwasher won't work--its a Kenmore, about 8 years old.
Stops midway through the cycle. I learned to do the thing where you press a series of buttons to reset it, but in the end the thing won't dry.

I assume I need a new heating element thingy. That sound right?
Do I have to call those dickheads at Sears or can someone else supply this?
How difficult to do it myself?

I tried running antifreeze through it and it didn't help.

Thanks!