What was found
WHEN EXTENDING FLAPS ON APPROACH LE FLAPS TRANSIT LIGHTS ILLUMINATED. NOTICED LE SLAT 2, 3 & 6 DID NOT EXTEND, INDICATION. THE CREW FOLLOWED QRH PROCEDURES & DID A GO AROUND. THE FLIGHT DECLARED AN EMER & LANDED WITHOUT FURTHER INCIDENT. ACCOMPLISHED BITE CHECK OF FSEU IAW AMM 27-51-00 & FOUND FAULTY UNIT. R & R FSEU IAW MM 27-51-01. ACCOMPLISHED ALL REQUIRED TESTS, ALL INDICATIONS NORMAL. OK FOR SERVICE & THE ACFT WAS NOT GNDED.