As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 16,000 FT VERY LOUD "THUMP" WITH ASSOCIATED AIRFRAME SHUDDER. COMPLIED WITH QRH ENGINE COMPRESSOR STALL/LIMIT/SURGE AND RETURNED TO DEPARTURE. DID A WALK AROUND OF AFT. NO AIRFRAME DAMAGED NOTED. ALL CONTROL SURFACES ACCOUNTED FOR. R & R NR 1 ENG ASSY LEAK AND OPS CKS NORMAL.