As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRST OFFICER'S WINDSHIELD STARTED TO ARC AT THE LOWER RIGHT CORNER, THEN CRACKED SHORTLY THEREAFTER. AIRCRAFT MADE A DIVERSION TO STL AND MADE AN EMERGENCY LANDING. REPLACED RIGHT WINDSHIELD IAW DC-9 MM 56-10-02-2-0004. REPLACED TEMP CONTROLLER IAW DC-9 MM 30-41-00-2-001.