As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT RETURNED TO ORD ON ACCOUNT OF DUAL RADAR FAILURE. EMERGENCY DECLARED. MAINTENANCE REPORTS FAULT CORRELATED TO MAINT MSGS 34-60122 AND 34-60121. REMOVED BOTH ISS PROCESSORS AND CLEANED FIBER OPTIC CONNECTIONS. REINSTALLED PROCESSORS. WX RADARS OPS CHECK GOOD.