DURING AN INSPECTION OF HOIST BY SURFACE SHOP, THEY TRIPPED A SLACK ROPE SWITCH TO TEST IT & IT WOULD NOT RESET. MSHA WAS CALLED AT 4 P.M. & ELECTRICIANS CHECKED THE SWITCH, REPAIRS WERE MADE & MSHA WAS CALLED BACK AT 4:40 P.M. ON SAME DAY & TOLD HOIST WAS BACK IN SERVICE.