What was found
FLT 7990 -SYR - EICAS MESSAGE LAV SMOKE, SMOKE IN CABIN. MAINTENANCE PERFORMED OPS CHECK OF ENG BLEED SYSTEM AND PACK SYSTEM INSPECTED LAV LIGHTING AND SMOKE DETECTION SYSTEM INSPECTED RECIRC FAN AND GASPER FAN. DETERMINED THE AIRCRAFT IS SAFE FOR INTENDED FERRY FLIGHT TO STL. AFTER ARRIVAL, COULD NOT DUPLICATE ON GROUND. MAINTENANCE REMOVED AND REPLACED THE FOLLOWING AS A PRECAUTIONARY MEASURE: NR 2 PACK DUAL TEMP VALVE, P/N: C143123, S/N: 04043135, MANU: HAMILTON SUNSTRAND. NR 2 FAN AIR VALVE, P/N: 816610-1, S/N: 2004061077, MANU: HAMILTON SUNSTRAND. NR 2 PRECOOLER, P/N 145-30609-401, S/N: 2952. MANU: EMBRAER. NR 2 ENG (SEE ABOVE) IAW EMB 145 AMM PROCEDURE, OPS CHECK GOOD.