As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD - INFLIGHT DCA-ORD. CREW REPORTED FIRST OFFICER PITOT HEAT FAILED. EMERGENCY DECLARED FLIGHT DIVERTED IAD LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED FIRST OFFICER PITOT TUBE. SYSTEM GROUND CHECK NORMAL OPERATION.