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Parts for MED5700TQ - AppliancePartsPros.com
See the attachment for the tech sheet
By light, I am assuming you mean the interior drum light.
I would look at the power first as it is tyhe most likely cause and is easier than taking the dryer apart.
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.
Unplug the unit and check the wires at the terminal strip in the machine to make sure none are loose or burned out
Check the power at the terminal strip.
Do this with the heater off and on.
Be careful as 240 volts is lethal !!!