What was found
FLIGHT 6010, LGA TO CMH - THE FLIGHT CREW RECEIVED A LAV SMOKE EICAS MESSAGE SHORTLY AFTER TAKEOFF. THE QRH WAS FOLLOWED AND THE CREW REPORTED THAT THERE WAS NO VISIBLE SMOKE, BUT THERE WAS A STRONG ODOR IN THE AFT CABIN AREA. THE AIRCRAFT RETURNED TO LGA AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT THE ODOR TO THE BE COMING FROM THE NR 2 COOLING PACK WHEN RUNNING OFF EITHER APU BLEED OR ENGINE BLEED SOURCES. THE NR 2 COOLING PACK WAS DEFERRED AND NO FURTHER DEFECTS WERE NOTED.