As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VOICE RECORDER AUDIO TEST FAILS PER MAINTENANCE CHECK. HIGH PITCH NOISE IN HEADSET ALL THE TIME. SECURED CONNECTOR ON BACK OF AREA MIC FOR HIGH PITCH NOISE AND FOUND CHANNEL 1 (1ST OBS) OF VOICE RECORDER UNIT INOPERATIVE. REPLACED VOICE RECORDER PER MM, TESTED PER MM.