What was found
HF RADIO #1 & #2 TRANSITION AND RECEIVES SLIGHTLY OFF OF FREQUENCY, FOR BOTH CAPTAIN AND FIRST OFFICER, TRANSMITTING AND RECEIVING IS ACCEPTABLE/SERVICABLE/USABLE. GROUNDED - YES. REF B737-800 FIM TASK 23-11 TASK 801 PERFORMED BIT CHECK OF HF SYSTEM, NO FAULTS FOUND AT THIS TIME, PERFORMED OPERATION CHECK ON GROUND OF HF SYS, OPS TEST NORMAL AT THIS TIME, NO HISTORY PAST 30 DAYS.