As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE CREW SELECTED UP WITH THE GEAR HANDLE, THE THREE GREEN LIGHTS EXTINGUISHED, THE RED GEAR UNLOCK LIGHT REMAINED ILLUMINATED. THE CREW FOLLOWED THE QRH PROCEDURE AND RETURNED TO BOS. APPROACH AND LANDING UNEVENTFUL. MAINTENANCE CHECKED STRUT SERVICE. FOUND NOSE STRUT 30 PSI LOW.