Hi,

Whirpool model LG7681XSN2

Some close that worked for me online....LG7681XSN3 LG7681XSW0
LG7681XSW1 LG7681XSW2 LG7681XSW3

Is there any web site that shows you how to take off the various covers/panels to look at the insides

Something that can help...
http://www.applianceaid.com/wpdryer_how-to.html

Do gas heating elements need to be changed?

Hot surface ignitor, coils on the gas valve are common trouble
makers...
http://www.applianceaid.com/gas_dryer.html

jeff.
Appliance Repair Aid
http://www.applianceaid.com/