What was found
AIR INTERRUPT, RETURNED & EMER DECLARED. LANDING UNEVENTFUL & ACFT OVERWEIGHT. CREWS REPORTS RT AT LIFTOFF GOT A TAKEOFF CONFIG WARNING HORN & LIGHT WHICH LASTED 3 SECONDS THEN WENT OUT. THEN WHEN RAISING FLAPS FROM 1 TO UP, FLAPS REMAINED AT 1. PERFORMED FSEU BITE CHECK WHICH SHOWED MSG 27-53280. INSPECTED WIRING & CB WITH NO FAULTS FOUND. ACCOMPLISHED FIM 27-51-00 FOR MSG. R & R FSEU & PERFORMED OPERATIONAL CHECKS IAW AMM 27-51-01. SYS CHECKED GOOD.