What was found
AIR TURNBACK, DURING ROTATION RECEIVED NUMEROUS BIRD STRIKES TO AIRCRAFT. ON RETURN TO ALB, NR 1 ENG VIBRATION GAUGE READ 3.0, APPROACHED 4.0 AT FL 240,THRUST LEVER REDUCED TO KEEP VIBRATION LEVEL TO BELOW 4.0. SMELL IN CABIN. PERFORMED BIRD STRIKE INSP PER MM NR 1 AND 2 ENG SHOWED EVIDENCE OF CORE INGESTION. REMOVED AND REPLACED NR 1 ENG FAN BLADE SET PER MM. AMENDED SDR 2028 NR 2 ENG BORESCOPED NO DAMAGE NOTED, NR 1 ENG ON 10 CYCLE FLYBACK BORESCOPE INSPECTION.