As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CO PILOTS LT BRAKE DEPRESSES ALL THE WAY TO THE FLOOR. PUMPING PEDAL TEMPORARILY RESTORES EFFECTIVNESS FOR A FEW SECONDS ONLY. REMOVED COMPLETE LT WHEEL BRAKE MASTER CYL PN 95367-17 SN 0921. INSTALLED OVERHAULED CO-PILOT LT WHEEL BRAKE MASTER CYL PN 95367-17 SN 1246 IAW MM 32-42-02. BRAKE BLEEDING ACCOMPLISHED IAW MM 32-41-00.