It keeps moving after you release the controls

Follow the shutdown and isolation instructions for your model. This draft doesn’t supply a universal procedure.

Tell the provider what continued moving and which control you had released. That detail explains the problem without another test. Don’t restart it to make a recording.

Describe where the snowblower is without trying to move unsafe equipment. Ask whether they can assess it at that location and make the control problem clear before arranging anything.

Sending an inquiry does not make the machine safe to use, and you still need confirmation that someone has accepted the visit.