As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: SMOKE DETECTOR SOUNDED IN FLIGHT ATTENDANT CREW REST AREA DURING ENGINE START. NO ASSOCIATED SMOKE OR SMELL. ALARM EXTINGUISHED ON ITS OWN AFTER 5 SECONDS. ACCOMPLISHED SATISFACTORY TEST OF ALL SMOKE DETECTORS IN MAIN CABIN CREW REST PER AMM 26-14-20. NO SKOKE DETECTOR OR SMELL NOTED.