What was found
ON DESCENT, AT 3,000 FEET, CREW RECEIVED A FLAP LOCKOUT AT 5 UNITS FLAP SETTING. AIRCRAFT DID NOT EXPERIENCE ANY ROLL AND THE CREW SUSPECTS THE WARNING WAS AN INDICATION PROBLEM. CREW DECLARED AN EMERGENCY AND DIVERTED, DUE TO LONGER RUNWAYS. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LT WING FLAP TRANSMITTER IAW MM 27-58-12. OPERATIONAL CHECK GOOD.