As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE CO-PILOTS INTERPHONE WAS INOP, CONTINUOUS STATIC WAS EMITTED FROM SPEAKERS AND CO-PILOTS OXYGEN MASK MICROPHONE WAS INOP DURING FLIGHT. THE MAINTENANCE PROVIDER TROUBLESHOT AND DETERMINED THAT THE NR 2 RADIO MANAGEMENT UNIT (RMU) WAS DEFECTIVE. THE RMU WAS REMOVED, AND A REPAIRED UNIT WAS INSTALLED. OPS CHECKS WERE SATISFACTORY, AND THE AIRCRAFT WAS RETURNED TO SERVICE.