#30 HOIST WENT DOWN AND MSHA WAS CALLED AT 10:08AM. ELECTRICIANS AND MECHANICS REPLACED CHECK VALVES BETWEEN BRAKE PUMPS AND RETURNED HOIST TO SERVICE AT 2:18 PM SAME DAY. MSHA WAS CALLED AT T HAT TIME AND TOLD HOIST WAS BACK IN SERVICE. WEST FORK MINE WAS CALLED AT 10:10 AND AGAIN AT 2:22 PM SAME DAY TO LET THEM KNOW STATIS OF HOIST.