The burner ignites but shuts off in about 30 seconds as the drum continues to turn. The burner will reignite in a minute or so but only stays lit for 10 seconds. So the Temp in the drum does increase some but will not dry the clothes. I have already replaced the coils 694540 and 694539 but there was no change. I am not sure what to replace next.

1) Thermal fuse 3392519 ?
2) Operating Thermostat 150F 694674 ?
3) Thermostat 205F 279048 ?
4) Thermostat Heater 61894 ?

Or something else. Is there a way to test any of these devices (or any others I missed) ?

Thanks