As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM INOPERATIVE, CAN CALL OUT AND RECEIVE CALLS. HOWEVER, RECEIVING STATION CANNOT HEAR OUR OUTGOING TRANSMISSIONS. THERE IS AN ECHO WHEN TRANSMITTING. CONDITION OCCURS ON BOTH SAT 1 AND SAT 2. ACFT GROUNDED. COULD NOT DUPLICATE, NO HISTORY 30 DAYS. ACCOMPLISHED SATCOM SYSTEM 1 & 2 VOICE TEST IAW AMM 23-15-00-730-801, TEST PASSED.