What was found
BEFORE LANDING WE RECEIVED AMBER CAS MESSAGE AUTOBRAKE FAIL & ASSOCIATED INFO MESSAGE 32 BRAKE - PRESS TRANSDUCER INOP WITH TWO ASSOCIATED MAINTENANCE MESSAGES ABOUT LEFT OUTBOARD AND RIGHT OUTBOARD TRANSDUCERS BEING INOP. CORRECTIVE ACTION: RECIEVED MODIFIED BRAKE CONTROL UNIT (PN: 90008495-3, SN: JAN20-5437). GAINED ACCESS TO AIRCRAFT AND REMOVED RH KIDNEY PANEL FOR ACCESS TO BCU. REMOVED AND REPLACED BRAKE CONTROL UNIT IAW GL7500 AMP REF. 32-43-01. PERFORMED OPERATIONAL TEST OF THE BRAKE CONTROL UNIT IAW GL7500 AMP REF. 32-43-01, OPS CHECK GOOD. CLOSED RH KIDNEY AND AVIONCS BELLY PANEL. RETURNED AIRCRAFT BACK TO NORMAL CONFIG.PN OFF: 90008495-3 SN OFF: MAY23-5817 PN ON: 90008495-3 SN ON: JAN20-5437