What was found
SMOKE REST UPPER DR3 EICAS MESSAGE AT CRUISE 4 HOURS INTO THE FLIGHT. FLIGHT ATTENDANTS CHECKED DOOR 3 LAV TO SEE IF A PAX WAS SMOKING/VAPING. CREW REST AREA HAD NO ODORS OR SMOKE NOR DID DOOR 3 LAV. TRASH CHUTES WERE INSPECTED ALSO AND NO EVIDENCE OR ODORS WERE FOUND. CREW REST DETECTOR WAS RESET PER ECL GUIDENCE. PERFOMED OFAR SMOKE DETECTOR SYSTEM TEST REF AMM 26-14-40-730-836-002 AND FIM TASK 26-14 TASK 819. NO FAULTS NOTED AT THIS TIME. REF GMM 06-35-10 INSTALLATION INSPECTED FUNCTIONALLY CHECKED AND FOUND SATISFACTORY. REQUEST FURTHER OBSERVATION AND INFORMATION NEXT FLIGHT.