(1)    If, after summary investigation, the office becomes satisfied that sufficient grounds exist to warrant a formal hearing being ordered as to the matters investigated, it shall set a time and place for a hearing. The office shall publish notice of any such investigation in its weekly calendar and any report and all matters considered by the office with respect thereto shall be available for public inspection upon request.

   (2)   Notice of the time and place for such hearing shall be given to the water carrier or railroad, and to such other interested persons as the office deems necessary, as provided in s. 195.04, and thereafter proceedings shall be had and conducted in reference to the matter investigated in like manner as though complaint had been filed with the office relative to the matter investigated, and the same order or orders may be made in reference thereto as if such investigation had been made on complaint.