What was found
AFTER LOWERING THE LANDING GEAR WE RECIEVED AN AUTOBRAKE FAIL CAS AND A BRAKE 50%DEGRADED CAS MESSAGE. POWERED UP AIRCRAFT & PERFORMED FAULT MESSAGES NVM & BCU DOWNLOADS. SET TO MCC/BOMBARDIER FOR EVALUATION. MANUFACTURER ADVISED SUSPECT & BAD LT BRAKE SOV. ACCESSES SYSTEM PARAMETERS & OBSERVED BRAKE PSI RISE & DROP FOR ANY DISCREPACIES. NOTED LT & RT OB BRAKES NOT REACHING FULL 3000 PSI. INSPECTED BRAKES & NOTED HYD FLUID LEAK AT RT IB BRAKE FUSE. GAINED ACCESS TO RT IB BRAKE HYD FUSE. REMOVED FUSE. FOUND O-RINGS AT UNION DETEREORATED. REMOVED & REPLACED WITH NEW O-RINGS. INSTALLED HUD FUSE. LEAK CHECKED GOOD. BLED BRAKES. OPS CHECKED GOOD & NO DEFECTS NOTED. WORK PERFORMED IAW AMM 32-43-33.