As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STATION BOX HAS 18 EACH OF SWITCH P/N 8-9992-693-0. SWITCH HAS HIGH FAILURE RATE. FAILURES RESULT IN NOISY AUDIO, LOW VOLUME, OR INOPERATIVE SWITCH FOR AUDIO SELECTION. NEARLY 75 P ERCENT OF STATION BOX REPAIRS REQUIRE REPLACMENT OF AT LEAST ONE SWITCH. NO ALTERNATE AVAILABLE. UFS ONLY CARRIER IN USA OPERATING THIS AIRCRAFT.