As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 400, FLIGHT CREW REPORT RIGHT ENGINE BANG AND A DECREASE IN EPR INDICATIONS, RETURNING TO NORMAL. SUBSEQUENTLY 2 MORE BANGS FROM THE RIGHT ENGINE AND THE CREW ELECTED TO SHUTDOWN THE RIGHT ENGINE AND RETURN. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE RIGHT ENGINE. RETURN TO SERVICE OPERATIONAL CHECK WAS PERFORMED AND ALL SYSTEM PARAMETERS NORMAL. AIRCRAFT WAS RETURNED TO SERVICE.