It shall be an affirmative defense to claim under sections 325F.6651 to 325F.6658 that (1) an alleged nonconformity does not substantially impair such use and market value, or (2) a nonconformity is the result of abuse or neglect, or of modifications or alterations of the farm tractor not authorized by the manufacturer.
Minn. Stat. § 325F.6657
1986 c 422 art 2 s 7