Hoist went down at 12:40 a.m. Electricians were called in and worked on lower contactor for hoist. Found problems, made repairs to the contactor and returned to service at 9:00 a.m. MSHA was called and told hoist was down at 12:50 a.m. Then MSHA was called and told hoist was back in service at 9:30 a.m. same day.