As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 2;500- LOUD BANG FROM NUMBER 2 ENG FOLLOWED BY FLAMES FROM TAILPIPE- 30 SEC LATER ANOTHER BANG FOLLOWED BY FLAMES AND SPARKS FROM TAILPIPE. RETURNED TO MKE NORMAL LANDING. ALL ENGINE PARAMETERS WHERE NORMAL NO INDICATIONS OF FIRE / [01] R&R?D #2 HMU PER TASK CARD 773-21-10 AND AMM 73-21-00