PITT-DES MOINES <PDM> GETS QUALIFIED AUDIT Pitt-Des Moines Inc said it will receive a qualified opinion from auditors on its 1986 and 1985 financial statements. It said the qualification related to its inability to determine the effects, if any, of the final resolution of a suit filed against it by <Washington Public Power Supply System>. The 1985 suit was dismissed in a 1986 lower court action, but the ultimate outcome of the matter is still uncertain since Washington Public Power has appealed to the U.S. Court of Appeals.