What was found
TAKEOFF WARNING HORN SOUNDED DURING T/O AT ABOUT 50-60 KTS. ABORTED THE TAKEOFF AND CLEARED RUNWAY. CONTACTED DISPATCH & MX CONTROL. PERFORMED THE T/O ABORT CHECKLIST. AFTER CONSULTATION WITH MX CONTROL, WE DECIDED TO ATTEMPT ANOTHER T/O. AIRCRAFT WAS CONFIGURED PROPERLY. WARNING HORN WENT OFF AGAIN, AT 90-95 KNOTS. WE AGAIN COMPLETED THE T/O ABORT CHECKLIST AND AGAIN THE A/C WAS CONFIGURED PROPERLY. COMPLIED WITH OPS CHECK OF TAKEOFF WARNING SYSTEM IAW AMM TASK 31-52-00-710-801. OPS CHECK GOOD. COMPLIED WITH FIM TASK 31-52-00-810-802 FAULT ISOLATION STEPS A 1 THRU 8, ALL VALUES NORMAL REF FIM 31-52-00-810-802 4A (9)-5B. FOUND CONTINUITY BETWEEN 9811.J5001 (PIN 46) & GROUND. FOUND CONTINUITY BETWEEN CONFIG CONNECTORS & FCECU. WING FLAP INDICATION GOOD, FLAP DRIVE TRANSDUCER VALVES GOOD. R&R FCECU AS PRECAUTIONARY MEASURE IAW AMM 27-00-01-000-802/400-802, OPS CHECKS FOR FCECU GOOD. PERFORMED OPS TEST OF T/O WARNING SYSTEM IAW AMM 31-52-00-710-801, OPS CHECK GOOD. OBSERVED T/O WARNING HORN SILENT AS APPROPRIATE. NO FURTHER DEFECTS NOTED. NO RELEVANT CDS FAULTS FOUND. RETURNED TO SERVICE.