HOIST WAS SURGING. ELECTRICIANS WERE CALLED AND THEY FOUND TWO RIBBON CABLES IN THE DC DRIVE UNIT THAT NEEDED TO BE REPLACED. THE HOIST WAS DOWN FOR APPROX. 1 HOUR FOR THE REPAIR. 11:30 AM TO 12:30 PM. THE REPAIR WAS MADE IN THE MCC ROOM ATTHE HOIST HOUSE.