As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN BRAKE PRESSURE IS APPLIED TO PEDALS, HISSING NOISE CAN BE HEARD AND FLUID LEAKS OUT OF LT PEDAL ON CO-PILOT SIDE. FOUND LINE CONNECTING TO UPPER PORT FITTING ON CO-PILOT'S LT MASTER CYLINDER CHAFED AND LEAKING REPLACED. REPLACED LINE WITH NEW. BLED BRAKE SYSTEM. OPS/LEAK CHECK GOOD AT THIS TIME. MAINTENANCE IAW M/M 32-42-00