As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT FIRE CARGO INDICATION AT 2000 FT ON TK-OFF 35L. SMELLED SMOKE WHILE RUNNING CHECKLIST. NO OBSERVATION FROM FIRE DEPT. AIR TURN BACK. REMOVED AND REPLACED LOWER CARGO SMOKE DETECTION CONTROLLER REF MM 26-16-06-400-801. TESTS NORMAL. OK TO CONTINUE. VISUALLY INSPECTED LOWER AFT PIT, NO DEFECTS NOTED, LOOKED AT ALL THE CARGO SYSTEM PDU€™S AND ASSOCIATED WIRES, NO DEFECTS NOTED.