As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - FLT 5694 - THE CREW REPORTED A LAV SMOKE WARNING MESSAGE ON THE EICAS AFTER T/O. THE QRH WAS FOLLOWED AND NO SMOKE OR FIRE IN THE CABIN OR CARGO WAS FOUND. MAINTENANCE INSPECTED AND REPLACED THE LAV SMOKE DETECTOR. OPERATIONAL CHECKS WERE GOOD.