What was found
ON FINAL APPROACH WITH FLAPS 30, NO FLAP INDICATION IN COCKPIT. FLIGHT ACCOMPLISHED A GO AROUND. EMER WAS DECLARED & FLIGHT LANDED WITHOUT FURTHER INCIDENT ON SECOND ATTEMPT WITH ZERO FLAPS. REPLACED FSEU PROXIMITY SENSOR & ACCOMPLISHED RESISTANCE & CONTINUITY CHECKS OF FLAP & SLAT SYS, INCLUDING INDICATING OF SAME SYS, CHECKED NORMAL. ALL WORK DONE & DOCUMENTED ON WO 9674181, 9674188 & 9674196, INCLUDING ALL CHECKS & SIGNATURES. THE ACFT WAS GNDED.