As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW HEARD A LOUD BANG AND STRONG AIRFRAME VIBRATIONS FELT. CREW DECLARED AN EMERGENCY AND RETURNED TO FIELD. (FLT 3133) REMOVED AND REPLACED UPPER TRANSLATING COWL AND UPPER AND LOWER CORE COWLS IAW AMM. REPAIRED DENTS IAW SRM AND REO.