This sounds as if there is a thermal overload switch cutting out. As per the serviceable parts, I do not see this as a replaceable part.
The question is why is it overheating. Since this is an oil free air compressor, there isn't a whole lot that would cause it to overheat other than the following:
-Clogged air filters
-Clogged check valve (item 67)  mastertoolrepair.com/ultraquiet-oilfree-...0020c-p-1218338.html
-The stator and the rotor could be rubbing together if the unit was dropped.

You would need to remove the transfer tube that fees into the check valve. There is a rubber cup and spring inside of the check valve. Look for any obstruction in that and the transfer tube. Is the unit still producing the same amount of air that it once did? If it is, then it is probably a motor issue, yet what is causing the resistance for the motor? The capacitor could also be bad. We have a test on how to test your capacitor here:  mastertoolrepair.com/how-to-test-capacitor-p-19193.html
Another test would be to test the check valve:  mastertoolrepair.com/howto-test-check-valve-p-22524.html