As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPT AND FO'S RADIO TUNING PANELS BOTH SHOW ACTIVE/STANDBY FAILURE WHEN HF2 IS SELECTED. GROUNDED - YES. ACCOMPLISHED SUCCESSFUL GROUND VERIFICATION TEST REF FIM 23-11 TASK 801 NR 2 HF COMM BITE TEST PASS W/ NO FAILURES LOGGED, HF NOW OPS NORMAL.