Tyson Trezona pleaded guilty to multiple charges, including aggravated theft tied to the Neon Sign Museum HVAC theft, under a deal calling for 28 months in prison and $4,919 restitution.

Tara Koch who was originally arrested on the allegations more than two years ago pleaded guilty to three counts of first-degree theft and five counts of first-degree aggravated theft before Wasco County Circuit Court Judge Marion Weatherford. 

Hydro agreed to plead guilty to negligent endangerment when it melted scrap aluminum coated in a mineral-oil-based mixture that, when combusted, produced hazardous smoke to its employees and the community. It occurred between 2018 and 2019. As part of its plea agreement, Hydro has agreed to pay $550,125 prior to sentencing in April.