As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD - FLT 2755 - DURING CLIMB-OUT FROM IAD, THE NOSE LANDING GEAR WOULD NOT RETRACT. CREW NOTICED A DROP IN HYDRAULIC PRESSURE. THE NOSE LANDING GEAR NEVER UNLOCKED AS A STEADY NOSE GEAR GREEN LIGHT REMAINED ILLUMINATED. FLIGHT RETURNED TO FIELD AT IAD AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. (X)