If the department of revenue finds upon its own investigation, or upon a showing by others, that the revaluation program for any county is not proceeding for any reason as herein directed, the department of revenue shall advise both the county legislative authority and the county assessor of such finding. Within thirty days after receiving such advice, the county legislative authority, at regular or special session, either (1) shall authorize such expenditures as will enable the assessor to complete the revaluation program as herein directed, or (2) shall direct the assessor to request special assistance from the department of revenue for aid in effectuating the county's revaluation program.