What was found
1) LOWER CARGO COMPARTMENT SMOKE DETECTION SYSTEM SHOWS CODE AC7444/FALSE ALARM WITH MX INDICATOR. SYSTEM OK LIGHT ON.2) DEFERRED AC7444 IAW MEL 26-10-1)-B), PAGE 6.(ALL OTHER FAULTS ANNUNCIATED BY MX DISPLAY). DMI #11944. 3) REF. DMI #11944 LOWER CARGO COMPARTMENT SMOKE DETECTION SYSTEM SHOWS CODE AC7444/FALSE ALARM WITH MX INDICATION. SYSTEM OK LIGHT ON.4) REPLACED FAULTY DETECTOR S/N AC744 PER DC-8 SUPPLEMENTAL M/M 26-15-05. OPS CHECKED SERVICEABLE PER DC-8 SUPPLEMENTAL M/M 26-16-00. DMI #11944 CLEARED. PLACARD REMOVED.