As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O GOT STRONG VIBRATIONS FROM FRONT LEFT OF THE COCKPIT. NOISE VERY LOUD. NO WARNINGS OR INDICATIONS OF ANY OTHER SORT. DID AIR-RETURN TO NRT. NO EMERGENCY DECLARED. FOUND LEFT NOSE DOOR SWINGING FREELY. R AND RD LT AFT DOOR STRUT ROD ASSY AND PERFORMED NOSE GEAR SWING CK & WORKS NORMAL AS PER AMM 32-22-04-2. DOOR REPAIRED PER EA #G-3220-T0348025 REV.A.