What was found
THE CREW REPORTED THE RECEIVED A FLAP FAIL MESSAGE DURING DESCENT INTO GRR. THE CREW DECLARED AN EMERGECNY AND DIVERTED TO ORD DUE TO DEGRADE BRAKING CONDITIONS IN GRR. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERIVCE. REMOVED AND REPLACED THE NR 3 LEFT FLEXIBLE SHAFT IAW AMM 27-51-06. (LEFT WING) THE OPERATIONAL FLAP SYSTEM CHECK WAS GOOD IAW AMM 27-51-00. THE FLAP CONTROL SYSTEM CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.