As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: BIRD STRIKE ON #1 ENGINE AFTER TAKEOFF AT APPROXIMATELY 700 FEET, ENGINE VIBRATION ON #1 WAS 9.9. AN EMEREGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO ORD WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. REPLACED #1 ENGINE AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER TASK CARD 26L40071001.