As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT AFTER TAKEOFF, RECEIVED SMOKE MID 1 MAIN DECK CARGO SMOKE. DECLARED EMERGENCY & LANDED. REPLACED SMOKE DETECTION CONTROL UNIT 50WU 1 & MID 1 IAW MM 26-19-34-04-09. OPERATIONS CHECKED & TESTED IAW MM 26-19-00-05-09, ALL TEST PASSED. FIRE SYS RESET & ISOL VLVS ON AIR PAGE WILL TURN GREEN DURING TEST & OFF WHEN RESET. FIRE WARNING WILL RESET WITH TEST. ACFT OK FOR SERVICE.