What was found
FLT 6901 - ROA-IAD - DURING APPROACH EXPERIENCED A FLAP INDICATION FAILURE. AIRCRAFT COMPLETED A NORMAL LANDING AT IAD WITH FLAPS AT 20 DEGREES AND FLAPS BEING PHHYSICALLY VERIFIED AT THE CORRECT POSITION BY THE FLIGHT CREW THROUGH VISUAL OBSERVATION THROUGH THE CABIN WINDOWS. MAINTENANCE TROUBLESHOT THE SYSTEM AND FOUND THE CONNECTIONS ON THE FLAP POSITION INDICATING TRANSMITTER DIRTY. CLEANED CONNECTIONS AND PERFORMED MAINTENANCE OPERATIONAL CHECK OF THE SYSTEM WITH NO FURTHER PROBLEMS. AIRCRAFT RELEASED FOR SERVICE. (M)