Minn. Stat. § 122A.47

A teacher with 20 or more years of allowable service credit under chapter 354 or 354A who was assigned to a part-time position under section 354.66 or 354A.094 after June 30, 1994, must be given the option of returning to full-time employment if the employer does not make the full employer contribution to the applicable pension fund under section 354.66, subdivision 4 , or 354A.094, subdivision 4 , after July 1, 1995. If an employer decides not to make the full employer contribution to the pension fund after July 1, 1995, it must notify any affected part-time teacher of this decision in writing within 30 days of the employer's decision. A teacher receiving this notice who wishes to return to work full time must notify the employer of intent to return to full-time employment within 30 days of receiving notice from the employer, and must return to full-time employment by the beginning of the next school year.