What was found
FLT 18 - SNA-PHX - EL - ON CLIMBOUT FROM SNA AND ON APPROACH INTO PHX, BSCU 1 FAILED RESULTING IN "BRAKES ANTISKID NOSEWHEEL STEERING" FAULT. BSCU 2 WAS ALREADY ON MEL. AN EMERGENCY WAS DECLARED AND THE PASSENGERS WERE BRACED. THE FLIGHT LANDED WITHOUT INCIDENT AND THE AIRCRAFT WAS TOWED TO THE GATE. MAINTENANCE REMOVED AND REPLACED THE BRAKING / STEERING CONTROL UNIT. BITE CHECK WAS GOOD. BSCU WAS A CONFIRMED FAILURE. UNIT FAILED OUTPUT TEST SYSTEM 2 DUE TO DEFECTIVE RELAYS AND TRANSISTORS ON INTERCONNECT 2 BOARD. IC 37,38 ON PROCESS BOARD HAD BROKEN PINS. RELAY MFG PN EFD2C26, IC MFG PN MK7726BQ.