As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
'SMOKE DR 5 REST' EICAS CAUTION MESSAGE DISPLAYED. ACCOMPLISHED CREW REST SMOKE DETECTION SYSTEM TEST PER MM 26-14-20 ALL 4 DETECTORS CHECK NORMAL ALSO ACCOMPLISHED GROUND TEST OF RECIRCULATION FANS TEST PASSED. TRIED TO DUPLICATE PROBLEM SYSTEM ALL TEST PASSED. AC OK FOR SERVICE.