Here are your parts
Replacement parts for WHIRLPOOL TEDS740JQ1 | AppliancePartsPros.com

Here is the wiring diagram
https://www.servicematters.com/d...0Sheet%20-%208528187.pdf

If you have not already done it flip the breaker off/on slowly a couple times. Sometimes you can loose half the line without actually tripping the breaker.
Better yet measure the voltage at the plug for 240 volts.
Also check that a wire has not burned off at the terminal block in the machine.

Next would be the heater. Measure it with a meter should be about 9 ohms.
Next would be the thermal fuse (cutoff) should be 0 ohms. This is the one on the heater assembly.

I would suggest you purchase a meter. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.

There is a good STICKY at the start of this forum about it's use.

Yes that would do it.

I always suggest that whenever you work on your dryer that you should clean/check your vent system.
Also if you have to open it up it is a good idea to also do the blower.