What was found
SMOKE REST UPPER DOOR 3 EICAS, FOLLOWED CHECKLIST, NO SMOKE FA & PILOTS REPORTED SMOKE ALARM WENT OFF IN CREW BUNK AREA. IT WAS RESET PER FAOM BUT A RED LIGHT ON SWITCH STAYED ILLUMINATED. PILOTS ALSO NOTICED THE LISTED EICAS FILED. NO SMOKE OR FIRE JUST HEAVY RUBBER, ELECTRONIC OR DRY ICE ODOR. EVENTUALLY WENT AWAY AND DID NOT RETURN UNTIL ON FINAL DESCENT, APPROX OVER NAPA AREA. CS ALSO STATED THEY NOTICED A HEAVY ELETRICAL ODOR. FOUND LOOSE CONNECTOR ON AFT SMOKE DETECTOR BUNK 5. REPLACED DETECTOR AS A PRECAUTION DUE TO PRIOR HISTORY AND CURRENT REPORTED ISSUE, SYSTEM OP CHECKS GOOD. REF AMM 26-14-50.