No heat here either

Our LG was running, but didn't heat either. So I checked the vent and found bird eggs in there. We then got a man to come to clean the whole dryer vent (he picked out a birds nest).

We then called an appliance repair service. He came, checked (smelled)everything and told us, that the control board needs to be replaced. This would cost $420 plus labor. Him just looking and smelling the dryer cost us $90.

My question: Is he ripping us off?

Thank you for your time.