As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF RADIO NR 2 WILL RECEIVE BUT WILL NOT TRANSMIT. HF NR 1 WORKS NORMAL. ACFT GROUNDED. CONFIRMED HF2 HAS NO SIDE TONE. REPLACED NR 2 HF COUPLER REF MM 23-11-61. OPS CK NO HELP STILL NO SIDETONE. SUSPECTS RELAY R9245 OR THE WIRE BETWEEN THE RELAY AND HF2 TRANSCEIVER REF WDM 23-11-11 SHEET 4. ON DEFERRAL.