As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF1 NOTHING BUT STATIC. UNABLE TO HEAR OR TRANSMIT. HF1 NEGATIVE SELCAL. HF2 WORKS, TRANSMITS, RECEIVES, AND SELCAL WORKS. GROUNDED - YES. USING MICROPHONE AND HEADSET FROM HF1 RT KEY INTERLOCK LIGHT IS ON WHEN MIC IS KEYED. REPLACED HF 1 COUPLER. BAD FROM STOCK. REPLACED WITH NEW COUPLER. INSTALLATION TEST PASSES, REF AMM 23-11-61/401.