As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2882 THE CREW REPORTED THAT DURING CLIMBOUT THROUGH 4500 FEET RECEIVED AN EICAS MESSAGE OF LAV SMOKE. THE CREW DECLARED AN EMERGENCY AND ELECTED TO RETURN TO XNA. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE E2 ZERO CARBON SEAL. REPLACEMENT COMPLETED IAW RR AMM 72-25-25-400-801. VIBRATION AND LEAK CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.