What was found
#1 HF WOULDN'T TEST. IT GOT STUCK IN THE TUNING PHASE. GROUNDED - YES. NOTE: HF 1 STARTED HAVING PROBLEMS AFTER PERFORMING MAINTENANCE ON HF 2. REF MM 23-11-61, 23-11-21, AND WDM 23-15-11 FOR TROUBLESHOOTING AND MAINTENANCE ACCOMPLISHED. CONFIRMED HF 2 WORKING AND HF 1 NOT WORKING. PERFORMED HF 1 TEST IN THE FOLLOWING CONFIGURATIONS: REMOVED HF 2 COUPLER. HF2 COUPLER OFF AND HF 2 TRANSCEIVER ON- HF 1 TEST FAIL. REMOVED HF 2 TRANSCEIVER. HF 2 COUPLER OFF AND HF 2 TRANSCEIVER OFF- HF 1 TEST PASS. REPLACED HF 2 TRANSCEIVER. HF 2 COUPLER OFF AND NEW HF2 TRANSCEIVER ON- HF 1 TEST PASS. INSTALLED HF 2 COUPLER. HF 2 COUPLER ON AND NEW HF 2 TRANSCEIVER ON- HF 1 TEST FAIL. REPLACED HF 2 COUPLER. NEW HF2 COUPLER ON AND NEW HF2 TRANSCEIVER ON- HF 1 TEST PASS. OPERATIONAL CHECKS OF ASSOCIATED TEST ON HF 1 AND HF 2 PASS. VERIFICATION FLT SATISFACTORY.