As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6203 - IAD-MHT - DURING CLIMB, AN UNSCHEDULED LANDING DUE TO BAD VIBRATION COMING FROM AFT AREA. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND OPENED DMI 41443, MEL 52-4, ON LAV DOOR. MAINTENANCE REMOVED AND REPLACED LAV DOOR AND CLOSED DMI 41443. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)