As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON LANDING FOR FLIGHT 7126 THE LEFT BRAKE ON THE FIRST OFFICERS SIDE DID NOT WORK. THE MASTER CYLINDER WAS FOUND TO BE BAD. THE MASTER CYLINDER WAS REPLACED IAW ATR72 M/M JIC 32-42-13 RAI 10000 AND CHECKED GOOD IAW ATR72 M/M JIC 32-42-00 OPT 10000.