As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. LAVATORY 3F 2R SMOKE ALARM ON DURING FINAL, AFTER LANDING NORMAL. LAVATORY SMOKE ECASS MESSAGE WITH NO SMOKE. MAIN DECK CREW REST BUNK SMOKE DETECTOR 777-200 FAULT FOUND WITH MAIN DECK CREW REST FORWARD LOWER BUNK, NOT LAVATORY. TROUBLESHOT SMOKE DETECTOR CABIN TEST PASSED, NO FAULT FOUND.