As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON CHECKING IN WIN KZAK RTU DISPLAYS "FAIL" FOR HF RADIO. GROUNDED - YES. ACCOMP HF TRANSCEIVER BITE TEST OF #1 TEST PASS REF AMM 21-11-00-740-003 ACCOMP HF COMMUNICATION TEST HF #1, TEST PASS REF AMM 23-11-00-730-001 ALSO ACCOMP. ACCOMP TEST, TEST PASS. REF AMM 23-27-00-730-120 ALL GROUND FUNCTIONAL TEST PASS.