HOIST WAS PULLING A LOADED SKIP OUT AND LOST POWER. HOISTMAN CALLED AN ELECTRICIAN IN TO CHECK IT. THE ELECTRICIANS FOUND A BAD BRAKE SET SOLENOID COIL AND REPLACED IT. MSHA WAS CALLED AT 3;50 A.M. AND REPORTED HOIST DOWN. MSHA WAS CALLED BACK AT 9:00 A.M. SAME DAY AND TOLD HOIST WAS BACK IN OPERATION.