As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A LAV SMOKE WARNING WHICH WAS CONFIRMED BY FLIGHT ATTENDANT. ENGINE WAS SHUT DOWN AT THE GATE AND MAINTENANCE WAS CALLED. MAINTENANCE TROUBLESHOT LAV SMOKE DETECTOR AND FOUND NO DISCREPANCIES. FURTHER INVESTIGATION LED TO A BOROSCOPE OF THE LT ENGINE WHICH REVEALED A LEAKING NUMBER THREE BEARING CARBON SEAL. AIRCRAFT WAS FERRIED TO A MAINTENANCE BASE FOR CARBON SEAL REPLACEMENT.