Here it is
https://www.servicematters.com/d...0Sheet%20-%202318069.pdf

And another one which has the diagnostics in it
https://www.servicematters.com/d...0Sheet%20-%202316566.pdf

Usually the polarity of a thermistor makes no difference but this is an appliance company so who knows if what they call a thermistor is actually a thermistor.

As a example for as long as I remember an unwritten rule is: Do not use "o" in Model Numbers, only zeros are used. Also a "Q" is not used as it can be confused with a 0.
Your actual model number is KSSo42QTX00

Looks like Kitchen Aide is making a concerted effort to confuse customers.
Next they will have 1's and I's in their numbers.

I would doubt that this will fix the unit, unless both gave an open or a short reading (error code). Even then I would be suspicious since it is unlikely that both would go at the same time.


http://www.applianceaid.com/frig.html
Perhaps the above will help you diagnose the problem.