As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT HF TRANSMISSION REPORTED DESTORTED AND HARD TO UNDERSTAND BY SFO RADIO ON FREQ 5574 KHZ ALSO DISTORTED ON SIDE TONE. UNABLE TO DUPLICATE ON GROUND SWAPPED RTS FOR TROUBLESHOOTING IAW MM. REMOVED AND REPLACED LT TRANSCEIVER, OPS CHECK GOOD IAW MM. (K)