As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - INFLIGHT STL-LGA. CREW REPORTED AC CROSSTIE LOCKOUT. WHEN AIRFOIL ANTI-ICE WAS SELECTED, OZONE TYPE ODOR NOTICED IN COCKPIT. EMERGENCY DECLARED FLIGHT DIVERTED ORD LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT AND RIGHT GENERATOR CONTROL UNITS. SYSTEM GROUND CHECK NORMAL OPERATION.