What was found
ANTI-SKID EICAS MESSAGE, BITE SHOWED BOX 4-8 & XDCR-4 AFTER RESET XDCR-4 PERSISTENT.SWAPPED POSN 4 WITH POSN 3 XDCR & FAULT MOVED ALONG INDICATING XDCR-3. REPLACED NR 4 TRANSDUCER & FAULT REMAINED UNABLE TO CLEAR. REPLACED & RESET AACU M102 FAULT 4-8 ISOLATED TO NR 4 TRANSDUCER REMAINS. EICAS MESSAGE NORMAL & ALT ANTI-SKID MESSAGE DOWN TO ANTI-SKID EICAS MSG ONLY. OHMED TWO WIRES FROM M102 CONNECTOR D2372B PIN B11 & B12 TO TRANSDUCER CONNECTOR D2022 PIN 1 & 2 HAD LESS THAN 4 & 2.4 OHMS FROM WIRES. IAW WDM PAGE 3, ANTI-SKID SYS IAW 32-42-11-3 TRIED MULTIPLE SWAPS WITH ANTI-SKID AUTOBRAKE CONTROL UNIT & TRANSDUCERS 3 & 4. UNABLE TO CLEAR 2, RECORDED MESSAGES FROM AACU A/B SEL & BOX 4-8. AB SELECTOR SWITCH PANEL & 2 ANTI-SKID VALVES ON AOG TROUBLESHOOTING STILL REQUIRED DUE TO TO PERSISTENT FAILURE & RETURN OF ALTN ANTI-SKID & NORM ANTI-SKID, STS MSG TOGETHER. BRAKE 4 HAS BEEN DEACTIVATED BY INSTALLING A32080-4. SECURED TO THE SHUTTLE VALVE BODY. ANTISKID MODULE SET TO DEACTIVATION 4 TO BE REINSTATED ON CLEARING OF DEFECT ALONG WITH REMOVAL OF DEACTIVATION TOOL. NR 4 MLG WHEEL TRANSDUCER R & R.