What was found
NORM ANTISKID EICAS S ANTI SKID SYSTEM FAILURE IN THE NORMAL SYSTEM. PILOTS STATED: TRIED RESET TWO TIMES. MESSAGES CAME BACK BOTH TIMES. AFTER 3RD, RESET MESSAGES DID NOT CLEAR. BIT THE ANTI SKID BOX, LAST FAULT IS BOX 2-6. ALSO HAVE FAULT BOX A/B . REMOVED COMPUTER AND TEMP INSTALLED NEW ANTI SKID COMPUTER. PERFORMED OPS TEST IN AMM 32-42-01-404-021. AFTER STEP 4 (B) 4) GOT FAULT CODE "BOX 3-7". ANTI SKID SWITCH DID NOT DISARM UNTIL 45 SECONDS. REINSTALLED ORIGINAL AUTO BRK/ANTI SKID COMPUTER. PERFORMED SAME TEST, GOT FAULT "BOX 3-7" AGAIN. REQUIRES MORE TROUBLE SHOOTING. REF FIM 32-42 FAULT TREE 802. ORIGINAL FAULTS WERE BOX A/B AND BOX 2-6. ACFT IN ORIGINAL CONFIGURATION. NO ANTI SKID OR AUTO BRAKE EICAS MESSAGES DISPLAYED AT ARRIVAL TO ACFT. ALIGNED , POWERED HYDS, RELEASED BRAKES CLEARED AACU FAULTS. ACP AACU BITE. BITE SHOWS BOX-3-7 AND PWR A-B FAULTS. EICAS SHOWS NO MESSAGES IN COCKPIT. AACU (WHICH WOULD INCLUDE 3-7 WHEEL CARD) HAS BEEN CHANGED. SUSPECT INTERMITTANT TRANSDUCER 3 OR M&E.