As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, THE NR 2 CARGO SMOKE DETECTOR FLASHED ON MOMENTARLY SEVERAL TIMES WITH ASSOCIATED AUDIBLE WARNING. THE CREW INSPECTED THE CARGO COMPARTMENT FOR SMOKE OR FIRE AND NONE WAS NOTED. THE CREW RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. MX INSPECTED THE ACFT FOR EVIDENCE OF FIRE, NONE WAS NOTED. THEY TROUBLESHOT THE SYS AND REPLACED THE NR 2 SMOKE DETECTOR. OPS CHECK GOOD IAW MM 26-.03. ACFT WAS RETURNED TO SERVICE