As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPT USED EMERGENCY AUTH TO STOP EXCESSIVE NOISE IN 1ST CLASS BY PULLING J9 C/B. CYCLED J9 CB FOR 30 SEC DID NOT FIX THE BUZZING 1ST CLASS SPEAKERS. LEAVING IT OUT FIXED IT. RESET PA AMP, ACCOMPLISHED DATA BASE DOWNLOAD, ALL OPS NOW NORMAL.