As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX AND F/A REPORT A VIBRATION AT FLOOR LEVEL, AT ROW 20DEF. NO ABNORMAL COCKPIT INDICATIONS. FOUND LOWER BELLY FAIRING SEALS ON PANELS 197GB AND 198GB DEGRADED FROM SKYDROL. TAPED SEALS PER MT53-004. REPLACED SEALS ON PANEL 197GB AND 198GB REF MT 53-017.