What was found
T/O WARNING HORN SOUNDED AT APPROX 70 KT WITH ALL SETTINGS NORMAL, & AFTER T/O THRUST WAS MET. FLAPS 1, TRIM 4.7, ALL GREEN LIGHTS SET FOR FLAPS & SLATS, REJECTED T/O & RETURNED TO GATE. MX CHECKED SECURITY & ADJUSTMENT OF STAB T/O WARNING SWITCHES PER BMM, & SPEED BRAKE T/O WARNING SWITCH IAW BMM, NO DEFECTS NOTED. FOUND FLAP T/O WARNING SWITCH INCONSISTENTLY MAKING & BREAKING AT DIFFERENT PLUNGER DEPTHS. R & R, ADJUSTED FLAP SWITCH IAW BMM. DUE TO HISTORY OF CONFIGURATION WARNING PROBLEMS R & R AURAL WARNING MODULE IAW BMM, & PRINTED CIRCUIT CARD IAW BMM, OPS CK GOOD. FUNCTIONAL CHECK COULD NOT CONFIRM REASON FOR REMOVAL, UNIT TESTED GOOD.