#31 HOIST LOST POWER, ELECTRICIANS FOUND A LOWER MAIN CONTACTOR BURNED UP. THEY REPLACED THE CONTACTS AND RETURNED THE HOIST TO SERVICE. MSHA WAS CALLED AT 12:20 P.M. AND TOLD HOIST WAS OUT OF SERVICE. THEN HOISTMAN CALLED MSHA BACK AT 12:50 P.M. SAME DAY AND SAID HOIST WAS BACK IN SERVICE.