As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW WAS FLYING AT FL370, FROM KCRQ TO MMHZ, APPROXIMATELY 40 NM FROM MMMZ THE COCKPIT OVERHEAD SPEAKERS STARTED MAKING THE SOUND OF INTENSE STATIC AT FULL VOLUME, CREW SWITCHED FROM COMM2 TO COMM 1 & CONFIRMED BOTH COMM 1 & COMM 2 WERE MAKING THE SAME STATIC SOUND, THE CABIN ATTENDANT NOTICED A ELECTRICAL SMELL IN THE GALLEY, PIC CONFIRMED THE SMELL, ORDERED THE CREW TO WEAR THEIR O2 MASK & DECLARED AN EMERGENCY THEN BEGAN THE EMERGENCY DESCENT INTO MMMZ. AIRCRAFT LANDED WITHOUT INCIDENT.