As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT BRAKE PEDAL ON PILOT'S SIDE WILL NOT HOLD PRESSURE WITH STEADY SLOW PRESSURE APPLIED, THE PEDAL GOES TO THE FLOOR. TS SYS REMOVED PILOTS LT WHEEL BRAKE MASTER CYLINDER AND INSTALLED OVERHAULED MASTER CYLINDER IAW AMM 32-42-02 REV 25. BLEED BOTH RT AND LT SYS IAW AMM 32-42-00 REV 25.