As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSY, FLIGHT 1888, MSY-PHL - THE FLIGHT RETURNED TO MSY DUE TO HEAVY AIRCRAFT MAINFRAME VIBRATION. THE CAPTAIN ADVISED THAT ON TRANSITION FROM FLIGHT LEVEL 24000 TO 25000 THE AIRCRAFT BEGAN TO VIBRATE AND DECIDED TO RETURN TO MSY FOR INSPECTION. MAINTENANCE REPLACED FIVE DOOR SEALS IN WING/BODY FAIRING AND TIGHTENED LOOSE FAIRING SCREWS.