I have a Sears Kenmore Stackable, Model# 41790802991, and I need to check the Thermal Fuse and possibly replace it. Where is it located?

A thermal fuse is a cutoff which uses a one-time fusible link. Unlike the thermal switch which automatically resets itself when the temperature drops, the thermal fuse is more like an electrical fuse: a single-use device that cannot be reset and must be replaced when it fails or is triggered. A thermal fuse is most useful when the overheating is a result of a rare occurrence, such as failure requiring repair (which would also replace the fuse) or replacement at the end of service life.

It is located on the exhaust vent just after or on the heating plenum. The dryer case has to be opened. On a stack unit that can be a challenge.

Both answers are spot on and the fuse is what it is so most DIYers won't try to replace them. If the fuse was resetable far too many people would just reset them and not tear into the issue causing the fault.