HOIST OPERATOR OBSERVED THE EAST HOIST MOTOR TRIPPING. IT WAS DETERMINED, AFTER TROUBLESHOOTING, THAT THERE WAS A BAD MOTOR BEARING. THE MINE WAS EVACUATED. THE EAST MOTOR WAS ELECTRICALLY REMOVED FROM THE CIRCUIT & THE HOIST WAS SAFELY TESTED SO IT COULD BE USED AS AN EMERGENCY MANTRIP (2 ESCAPEWAYS). THE REGULAR ACCESS HOIST WAS NOT AFFECTED. UP AGAIN AT 4:20PM.