As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF AT ROTATION, LOUD SERIES OF BOOMS HEARD. CREW CONDUCTED FLY BY AND ADVISED BY CONTROL TOWER TO LAND. AIRCRAFT LANDED SAFELY. SUBSEQUENT BOROSCOPE INSPECTION OF NR 2 ENGINE REVEALED HEAT DAMAGE TO MULTIPLE STAGES OF TURBINE SECTION. (K)