As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTED THAT RIGHT BRAKES LOST PRESSURE AT SOME POINT DURING THE RETURN FLIGHT BACK TO KBFI, TESTED ON FINAL AND FELT NO RESISTANCE AND FELT NO BRAKING AFTER LANDING. DURING TROUBLESHOOTING, MAINTENANCE DISCOVERED NUMBER THREE BRAKE ASSEMBLY LEAKING AROUND INPUT FITTING. REPLACED O-RINGS BUT NO CHANGE IN LEAK. INSPECTED O-RINGS AND FOUND NO NICKS OR DAMAGE. MAINTENANCE REPLACED NUMBER THREE BRAKE ASSEMBLY. OPS CHECKED GOOD.