As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB CREW REPORTED OF A VIOLENT SHAKE & LOUD BANG. DURING RETURN APPROACH CREW REPORTED UNUSUAL FLIGHT CHARACTERISTICS WHEN FLAPS SELECTED TO 30. NORMAL FLIGHT CHARACTERISTICS REGAINED WHEN FLAPS SELECTED TO 25. RETURNED TO DEPARTURE, EMERGENCY DECLARED. R & R RT ENGINE. POWER PLANT ENGINEERING REPORTS NO FAILURES FOUND.