As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PWM/BOS - FLT 4605 - DURING CLIMB-OUT, CREW NOTED THE HYDRAULIC PRESSURE DROPPING DURING GEAR RETRACTION. THE AIRCRAFT RETURNED TO PWM AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RIGHT GEAR DOWNLOCK HYDRAULIC SWIVEL. GEAR SWINGS AND OPS CHECKS WERE PERFORMED, AND AIRCRAFT RETURNED TO SERVICE. (X)