As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT THROUGH FL 210 LAV SMOKE EICAS WARNING COME ON WITH ORAL ALERT AND REMAINED ON FOR 30 SEC THEN WENT AWAY FA'S HAD INDICATION ON CMS FOR AFT LT LAV. NO SMOKE NOTED. CHECKED FOR FAULT MESSAGES, NONE WHERE FOUND. RESET A/C POWER PER CS100 BD500-A-44-11-01. ACCOMPLISHED FIRE DETECTOR TEST NO TROUBLE FOUND OK FOR SERVICE. (LP# 6579340)