As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HF RADIO FAULTY, FLIGHT DIVERTED. AIRBORNE CLIMBING THROUGH FL190 LEFT HF RADIO TOOK 17 SECONDS TO AUTOTUNE AND WOULD NOT TSMT. REPLACED LEFT TRANSCEIVER AND CALLED SFO ON 6.640 KHZ, OPS CHECK OK. COUPLER TUNED IN 11 SECONDS. ALL WITHIN TOLERANCE OF AMM. DUE TO PREVIOUS GRIPES TOMC REQUEST LEFT HF COUPLER REPLACEMENT. REPLACED LEFT HF COUPLER PER MM, LEFT HF OPS CHECK TEST GOOD.