What was found
L INBD BRAKE FAIL AMBER CAS: L INBD BRAKE FAIL AMBER CAS ILLUMINATES WHEN RIGHT SEAT PILOT BRAKES ARE APPLIED. B3=006927. GAINED ACCESS TO BRAKE CONTROL UNIT IN L./H AVIONICS CLOSET. REMOVED BCU P/N: 142-045-2 S/N: 865 AND REPLACED WITH A CUSTOMER SUPPLIED REPAIRED BCU P/N: 142-045-2 S/N: 126, REF CL-350 AMM 32-43-01. PERFORMED OPERATION TEST OF THE BRAKE SYSTEM REF 32-43-00. OPS CHECKED GOOD. REINSTALLED BELLY PANEL 182BL REF CL-350 AMM 53-63-17 SERVICED BOTH L./H AND R/H HYD SYSTEMS REF CL-350 AMM 12-12-00. REINSTALLED L./H AVIONICS CLOSET REF CL-350 AMM 25-72-01.