Your Model Number is KUDI02CRBL2 an "i" not a one
Used to be an unwritten understanding the only ones were used in Model Numbers etc.. Then some idiot at Kitchen Aid decided "Lets confuse everybody" and also use i and L.
Just venting, as stoopid decisions by companies really ticks me off.

Here are your parts
Heater parts replacement parts for WHIRLPOOL KUDI02CRBL2 | AppliancePartsPros.com

Here is a tech sheet
http://www.servicematters.com/d...0Sheet%20-%208572216.pdf

Have you changed your dishwasher detergent recently?
Has something changed with the house plumbing re: a new water softener?
Is it drying the dishes OK? If not you may have a heater problem.
I am not sure if your unit uses a thermistor to monitor the water temperature. Check to be sure that the water entering the unit is at least 120 degrees.

If you use detergent capsules I would try a granulated detergent.
Do you use rinse aid, perhaps it is not dispensing.

Here is a good link with some additional help
http://www.applianceaid.com/dish.html

If everything else with the machine is good you may want to try using less detergent.

I wonder if there is cleaning agent, ie, vinegar or bleach that I can run through a cycle before I actually wipe off the residue left over from a cycle?
Vinegar will work if it is a calcium deposit, add a quart to a wash cycle.
If the unit has a short wash (pre-wash) and then a long wash use the long wash. Let it pump/wash for a couple minutes then pause the cycle and let it soak for half an hour or so. Then let the cycle complete.
You may have to do this a number of times to clean out the entire system..