As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT ATTENDANT REST UPPER DRS4 EICAS SMOKE MESSAGE. DISAPPEARED IN 40 SECONDS. FLIGHT ATTENDANTS CHECKED AREA AND CABIN. NO SMOKE DETECTED. PERFORMED RESET OF SMOKE DETECTION SYSTEM AT FLIGHT ATTENDANT REST AREA PER AMM 26-14-40. CHECKS OK.