As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 HF SIDE TONE QUALITY IS BAD AND BARELY READABLE IN RECEIVE MODE. TRANSMIT IS NORMAL. UNABLE TO VERIFY SIDE TONE DISCREPANCY WITH NR 2 HF SIDE TONE REMOVED AND REPLACED HF NR 2 TRANSCEIVER IAW MM 23 11 21 AS PRECAUTIONARY PERFORMED SUCCESSFUL GROUND VERIFICATION CHECK.