Diagnosing a busted heating element and/or thermostat and/or fuse requires the answer to like two questions. Does it produce heat while it's running? Is it a Samsung? Okay maybe just one question. The $29 heating element comes with a new thermostat and fuse so you just replace them all regardless.
They did not. All they did was turn the dryer on to see if any heat was produced. The dryer spun and seemed like it was working, but no heat. So they said heating element and or thermostat. They replace both as a precaution.