What was found
NR 1 WARNING HORN (CLACKER) SOUNDED DURING TAKEOFF ROLL. MACH AIRSPEED WARNING SYSTEM DEFERRED IAW MEL 34-4-3 CAT-B. DMI 15965. SP34-4 COMPLIED WITH CIRCUIT BREAKERS PULLED TO DEACTIVATE SYSTEM. REJECTED TAKEOFF BECAUSE OVER SPEED WARNING CLACKER SOUNDED. A/C WEIGHT = 136.2, IAS = 120, OAT = +6, PA 620, CAUTION ZONE. COMPLIED WITH DHL BOEING M/M HIGH ENERGY STOP SPECIAL INSPECTION CHECK PER 5-51-121. NO DEFECTS NOTED. BRAKE COOL DOWN PERIOD OF 38 MINUTES OBSERVED. REF ITEM 2P LOG PAGE 372821 FOR OVERSPEED WARNING CLACKER. REF DMI 15965 NR 1 WARNING HORN (CLACKER) SOUNDED DURING TAKEOFF ROLL. REPLACED NR 1 AIRSPEED INDICATOR OPS CHECKED GOOD PER M/M ADJUST/TEST 34-14-0. THIS CLEARS DMI 15965.