What was found
AIRBORNE, BOTH HF NR 1 AND HF NR 2 NEITHER RADIO WOULD TUNE, NO TUNING SIDETONE FOR EITHER RADIO. WE COULD HEAR CONVERSATION ON BOTH HF RADIOS. NEITHER L OR R WOULD TUNE OR TALK ON EITHER RADIO. GROUNDED - YES. PERFORMED HF BIT CHECK ON HF NR 1 AND HF NR 2 REF FIM 23-11 TASK 801. BITE CHECKS PASSED - CYCLED NR 1 HF AND NR 2 HF C/B`S AND PERFORMED HF SYSTEM TEST ON HF NR 1 AND NR 2, BOTH SYSTEMS GROUND VERIFICATION NORMAL, REF AMM 23-11-00. AIRCRAFT OK FOR SERVICE.