As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AND JUST AFTER GEAR RETRACTION, THE A-SYSTEM HYDRAULIC FAILED. CREW FOLLOWED COM PROCEDURE AND DIVERTED TO BOS AND MADE UNEVENTFUL LANDING. MAINTENANCE REPLACED RUPTURED FLEX LINE ON RIGHT MAIN LANDING GEAR UPLOCK ACTUATOR. LEAK AND OPERATIONAL CHECK OK.