What was found
ON GROUND GOT RED BAGGAGE FIRE LIGHT CAS MESSAGE. POWERED UP ACFT & ABLE TO DUPLICATE DISCREPANCY, WENT THRU FAULT HISTORY & FOUND ALERT ID 593. THIS FAULT IS TRIGGERED WHEN AFT CARGO SMOKE DETECTOR INPUT TO GSD2 INDICATES SMOKE DETECTED. IAW TROUBLE SHOOTING GUIDE AMM 26-12-00. FOUND SMOKE DETECTOR FAILED RED LIGHT ON, & FWD DETECTOR RED LIGHT OFF. VERIFY & FOUND POWER ON CONNECTOR, BUT SYS TEST FAILED. REMOVED AFT SMOKE DETECTOR, FOUND COVER WITH DUST, CLEANED, VERIFY CONNECTION PINS & FOUND OK, INSTALLED SMOKE DETECTOR (UCI0I) IAW AMM 26-12-05 & RED LED LIGHT OUT. PERFORMED AFT CARGO SYS OPS CHECK IAW AMM 26-12-0D, SYS WORKING PROPERLTY, NO RED CARGO FIRE LIGHT, NO CAS MESSAGE. OPS CHECK OK