As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT BOS DURING T/O ROLL AT 110KTS RECEIVED HYD 3B CAUTION MSG. THEN IN CLIMBOUT AFTER GEAR HANDLE UP, RECEIVED NOSE DOOR WARNING AND GEAR DISAGREE. EMERGENCY DECLARED, A/C RETURNED TO BOS LANDED SAFELY. REMOVED AND REPLACED HYD 3B PUMP. NO FURTHER DEFECTS.