Modifying certain provisions governing the Duluth teachers retirement fund association; modifying the normal retirement age for certain members; authorizing and providing for members receiving temporary workers compensation payments and a reduced salary or no salary to purchase allowable service credit for the period; providing a partial postretirement adjustment to certain annuitants or benefit recipients; modifying the normal coordinated retirement annuity formula percentages; granting approval for the Duluth TRA to amend the articles of incorporation or bylaws by increasing the formula percentage used in computing annuities for old law coordinated program members (ra)