What was found
FLIGHT 3217 - LGA-PHL - WHILE EN ROUTE A LAV SMOKE MASTER WARNING APPEARED ON EICAS. THE APPROPRIATE QRH CHECKLIST WAS COMPLETED. THE FLIGHT ATTENDANT CHECKED THE LAV AND SAW NO SMOKE OR FIRE AND NO SMELL WAS PRESENT ANYWHERE IN THE AIRCRAFT. THE EICAS MESSAGE WENT OUT AND THE FLIGHT CONTINUED UNEVENTFULLY. THE AIRCRAFT WAS FERRIED FROM PHL TO IND WITH THE NR 1 BLEED SYSTEM OFF. MAINTENANCE FOUND THE NR 0 CARBON SEAL TO BE LEAKING. REMOVED AND REPLACED THE NR 1 ENGINE NR 0 CARBON SEAL IAW ROLLS ROYCE MM 72-25-24-400-801, 72-21-300-400-801, AND 72-21-30-410-001. PERFORMED ENGINE CHECK RUN IAW 72-00-00-700-801. NO LEAKS OR SMELL NOTED AT THIS TIME.