As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#147, EWR-SJU. "DURING CRUISE #1 FA CALLED STATING LOUD HUMMING NOISE AND VIBRATION IN CABIN FLOOR NEAR ROW 13. CA INVESTIGATED AS WELL. NO OTHER INDICATIONS ON SYSTEMS. PAGE POSSIBLE LOOSE PANEL OR FAIRING SEAL" (SUPPLEMENTAL INFORMATION TO FOLLOW)