Minn. Stat. § 579.06: PLEADINGS; TRIAL; JUDGMENT.

The party summoned may by answer deny that the judgment was duly rendered, or that the answerer was master, owner, or part owner of the boat or vessel when the cause of action against it arose, and may set up any defense which has arisen since the rendition of the judgment, but no other defense. The party issuing the summons may demur or reply to the answer, and the party summoned may demur to the reply. The issues shall be tried, and judgment, with costs, shall be rendered and enforced in the same manner as in a civil action.