What was found
FLT 4874 - DURING APPROACH INTO TYS FROM ATL, THE CREW RECEIVED A FLAPS UNLOCK MESSAGE. IN COMPLIANCE WITH THE PILOT'S OPERATING HANDBOOK, THEY COMPLETED A GO AROUND AND PERFORMED A ZERO FLAPS LANDING. DUE TO WEATHER CONDITIONS, AS A PRECAUTION THE CREW REQUESTED EMERGENCY VEHICLES BE ON STAND-BY. THE AIRCRAFT LANDED SAFELY IN TYS. MAINTENANCE REMOVED AND REPLACED THE FLAP VALVE BLOCK, FLAP ACTUATORS AND TWO OF THE FLAP ACTUATOR HOSES ON THE LEFT OUTBOARD SIDE. OPS AND LEAK CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)