As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORT -AIRFRAME VIBRATION AT 300KTS- 310KTS AT 28,000 FT, DID NOT TRY FASTER SPEED BELOW 300 KTS NO VIB. NO VIB INDICATION FOR ENGINE & NO ECAM INDICATION OF FLIGHT CONTROL ANOMOLIES. FOUND LT NLG AFT DOOR WITH EXCESSIVE PLAY. REPLACED LT AFT DOOR IAW MM 32-22-13-400-01A & MM 32-22-00-220-001A.