As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FO COMM POS UNABLE TO HEAR FA OR ALTITUDE ALERTING SYS. UNABLE TO DISCERN FROM CAPT AND ATC. WHEN USING OBS DAP AND JACK NORMAL OPS. NOTE CONSTANT BACK- GROUND NOISE LIKE AN OPEN MIC ON FO SIDE. CREW ALSO REPORTED SQUEAL ON COMM 3. REMOVED AND REPLACED DIGITAL AUDIO PANEL IAW AMM 23-51-01. OPERATIONAL TEST GOOD. OK FOR SERVICE.