If the dryer has not ran for a while it will heat up fine. Then after about 10-15 minutes no heat at all. I have an Ohms meter not sure were to start the check list. Air flow is good and lint is at a minimal. Any starting point would be greatly appreciated. THANKS!

Most likely this is caused by the electronic control, since it works until it gets hot. Part number is 8558178 and it runs around $130.00. You can find it cheaper on Ebay though. I recently saw one for $66 on Ebay.