What was found
ANTI-SKID FAIL DURING TAKEOFF AT 70 KTS, REJECTED TAKEOFF TIME 1335Z. RTRN TO GATE FOR 45 MIN BRAKECOOLING, BTM INOP. ASCU LAST LEG LOGGED SYS1 VALVE 2, NO CURRENT FAULT. CHK`D WIRING FROM ASCU TO NR 2 VALVE REF WDM 32-45-03 PG 501, RESISTANCE, CONTINUITY AND NO SHORT TO GRD CHK`D OK. REMOVED AND REPLACED SYS 1 ANTI-SKID VALVE NR 2 PER AMM 32-45-21-4, LEAK CHK OK. REMOVED AND REPLACED ASCU AND RTS OK PER AMM 32-45-01. ANTI-SKID OP TEST OK PER AMM 32-45-00-5. ACFT OK FOR SVC. R/I FROM FACT PREMATURE REMOVAL/INSTALLATION OFF MFG 6000189-4.