As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY WAS DECLARED AFTER COMMS WERE LOST.RADIO CABINET 2 FAIL, RADIO2 FAILURE.EXTREMELY LOUD, CONSTANT SCREECHING AUDIO TONE VIA COCKPIT SPEAKERS AS WELL AS CABIN SPEAKERS. CO-PILOT WAS UNABLE TO HEAR PILOTS COMMUNICATIONS NOR THOSE OF ATC. CPDLC CONTINUED TO WORK AND LANDING WAS UNEVENTFUL.