As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF DURING GEAR RETRACTION, HEARD LOUD POP NOISE AND EXPERIENCED MODERATE FLUTTER. ALL GEAR INDICAITONS WERE NORMAL. FLIGHT RETURNED TO PHL AND LANDED WITHOUT INCIDENT. FOUND RIGHT NOSE GEAR DOOR STOP CABLE BROKEN. REMOVED CABLE AND HARDWARD AND PLACARDED SYSTEM PER MEL 32-7. AIRCRAFT APPROVED FOR SERVICE.