As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT TLH, CREW REPORTED LOUD HUM / BUZZ OVER CABIN SPEAKER WITH SMELL OF ELECTRICAL SMOKE NOTICED IN FIRST CLASS CABIN AND GALLEY AREAS. MAINTENANCE TROUBLESHOT, REMOVED AND REPLACED COCKPIT INTERPHONE CONTROL UNIT AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.