Minn. Stat. § 216.14: NOTICE TO RESPONDENT.

Upon filing such complaint, if there appear reasonable grounds for investigating such matter, the commission shall issue an order directed to and requiring such carrier or warehouse operator to grant the relief demanded or show cause by answer within 20 days from the service of such notice why such relief should not be granted. Such order, together with a copy of the complaint, shall forthwith be served upon the respondent.