Sure its broken? I have more than once fixed a “broken furnace” by finding and replacing the internal tube fuse in the control box.
If it was a slow decline you might need a professional, but if it just went from working to dead spending 5minutes with a powered down ( turn off the breaker ) furnace and a flashlight might make more sense.
I have a service with my oil company and it usually does not cost anything for the visit other than parts. I have had good experiences with Sound Oil and Glendale Heating.
I second the advice on Southwest Plumbing. A few years ago, they charged my mother in law (90years old) $600.00 to replace a simple, straight forward bathroom faucet. I should have done it myself.
