As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROTATION, LEFT ENGINE FAN VIBRATION WENT INTO AMBER RANGE. DECLARED AN EMERGENCY AND DIVERTED. LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. ON POST FLIGHT INSPECTION, FOUND THE LEFT INBD TIRE WAS MISSING TREAD. R & R TIRE NR 2 IAW 32-002. NO FURTHER DEFECTS NOTED.