As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE INDICATION IN MAIN CABIN, CREWMEMBER INSPECTED WHILE WEARING PBE. TURNED TOWARD NEAREST SUITABLE AIRPORT. AFTER INSPECTION NO SMOKE NO FIRE & PROCEEDED TOWARDS ANC. CLEANED & SECURED NR 3 SMOKE DETECTOR GND. R & R 3 WIRES AT FS 470 FWD OF DOME LIGHT IAW DC6 LMM28-5-2.