You will need to run the continuity tests using the multimeter.
The problem could be with the control board and/or control panel, control thermal fuse, control power transformer.
If you are not sure that you can do the troubleshooting call the repair company.
If you do have the meter and basic skills - let me know and I'll help you with the troubleshooting.
Here are the breakdown diagrams and Top Venting parts for Whirlpool GBD307PDS09 - AppliancePartsPros.com