I have a Whirlpool Electric Dryer, model # LEB6000PQ0.

The dryer does not seem to dry the clothes much at all.

I have removed the lint from all components (internal & external) as well as the vent from the back of the dryer to the outside.

I notice when the dryer first starts, the heating element turns on for about 1 or 2 minutes then shuts off. The tumbler and blower continue to run, but the heat never turns back on after the initial shut-off.

Could it be a thermostat or some other sensor that has gone bad, thus prohibiting the heating element to turn back on?

Any help would be greatly appreciated. I don't want to have to resort to a costly service call... I'm pretty certain I could replace the part(s) myself if I just knew where to start.

Thanks in advance for your help!

I would take Meter and check voltage across thermal sensors on duct. Turn dryer on, then when heating stops, carefully measure across sensors. Zero volts means sensor closed.
If you measure 240 volts across sensor, it is open, replace.

Is there anywhere that I can access a wiring diagram for this dryer so that I can make sure I'm checking the correct sensors/circuits?

They will be mounted on dryer duct(where the air goes through).
Test all. Takes less than a minute to test with meter. The one with voltage across sensor, is the one that is open.
Schematic not to important for these test. If not these sensors, schematic sill help.
Another thing comes to mind, is maybe element opening when hot(expands), then cools down an reconnects. Check sensors first.
To test that. Would measure voltage at element terminals, and with Amprobe, If voltage to element, and No current, Element is open.
Great for testing water heater elements. Voltage at element, and no current, element is open. No need to disconnect wires and do resistance test. Quick