As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION FELT IN FLOOR OF COCKPIT. FEELS LIKE SOURCE IS UNDER-FORWARD AND RIGHT. MAINT TEXT: CREW REPORTED VIBRATION THROUGHOUT FLT MOST AT CRUISE ALT ONLY IN COCKPIT, PILOT SAID NOTHING OUTSIDE OF FLT DECK. REPLACED FWD LEFT NOSE GEAR DOOR AFT SEAL.