Okay...the write-up you read was advice for ELECTRIC dryers. The model number you provided is for a GAS dryer. You have a burner assembly in your dryer instead of a heating element. The likely culprit on a gas dryer that no longer heats, is the igniter. The following link will shed some light on how the igniters work:
I know the link is for advice on how to replace an igniter in a gas range, but the theory of operation is the same. Read the top portion of the link I provided.
The igniter will become weak with age and will either stop glowing, or will glow, but not draw the necessary current to open the gas safety valve. This is a designed safety feature that prevents free flowing gas from entering the dryer cabinet without ignition. I would recommend you check first to see if the igniter is glowing. You can see an illustration of what I'm talking about by going to searspartsdirect.com and entering your model number. If you look under the "Burner,Valve" heading on the next page, the igniter is listed as item 74. Let me know what you find.