Your model number is incomplete.
Sears numbers are usually 3 digits, a period and an additional 8 digits.

Below is how to check the power.
I am assuming it is an electric dryer.
It is the L1 to Neutral side of the line that runs the motor.

Try flipping the breaker off/on slowly a couple times. Sometimes you can loose half the line without actually tripping the breaker.
Check the voltage at the plug
L1 to L2 should be 240 volts
L1 to Neutral and L2 to Neutral, both should be 120 volts.
If OK
Unplug the unit and check the wires at the terminal strip in the machine to make sure none are loose or burned out
If OK
Check the power at the terminal strip.
Do this with the heater off and on.
[COLOR="Red"]Be careful as 240 volts is lethal !!![/COLOR]

If all OK
check the door switch.
Also most units have a thermal fuse on the blower. Unplug the unit and check that it is 0 ohms.

Also some units have a belt switch down by the motor which also kills power to the motor if there is a problem with the belt.