As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS-FLIGHT#3898. CREW REPORTED MAIN AND EMERGENCY BRAKES FAILED AND LOSS OF #2 HYDRAULIC CONTENTS. MAINTENANCE REPLACED LEFT OUTBOARD BRAKE FLEX LINE. #2 HYDRAULIC SYSTEM SERVICED AND LINE BLED. OPERATIONAL CHECK WAS GOOD. AIRCRAFT RETURNED TO SERVICE.