If the oven liner is not cut or configured for the exact specifications of the oven and it is placed over any vents or other openings in the oven, carbon monoxide can build up, posing a risk of carbon monoxide poisoning to consumers.
The gearbox could have mistakenly been installed upside down by the STIHL dealer causing the tines to rotate backwards toward the operator, posing a laceration hazard to the user.