What was found
UNABLE TO TRANSMIT ON HF 1. HAD DIFFICULTIES INITIALLY CONTACTING SFO RADIO AND HF1 TUNER TOOK A LONG TIME TO TUNE. LONG AUDIO TONE. THE TRAMSMIT FUNCTION BECAME COMPLETELY INOPERABLE USING CAPT AND FO AUDIO PANELS. GROUNDED - YES. UNABLE TO VERIFY DEFECT ON GROUND. REMOVED AND REPLACED #1 HF TRANSCEIVER REF B737-800 AMM TASK 23-11-21-000-801 AND AMM TASK 23-11-21-400-801. BITE TEST GOOD REF B737-800 FIM 23-11 TASK 801. OP'S CHECK TO SFO RADIO GOOD. REQUIRES NON-ETOPS REVENUE FVR TO VERIFY FUNCTIONALITY OF THE #1 HF COMM PER SEAMC. REF L/P 11763929 #1 HF OPS TEST VERIFICATION FLIGHT SATISFACTORY,THIS CLEARS FVR AND A/C IS ETOPS QUALIFIED.