As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH SATCOM 1 AND 2 INOPERATIVE IN FLIGHT. DISPATCH WAS ABLE TO HEAR OUR TRANSMISSIONS AND ESTABLISHED A CONNECTION BUT WE WERE UNABLE TO HEAR ANY VOICE COMMUNICATION FROM DISPATCH. GROUNDED - YES. ACCOMPLISHED SATCOM SYSTEM TEST REF B737-800 AMM 23-15-00. BOTH SATCOM 1 AND SATCOM 2 OP CHK GOOD. NO HISTORY LAST 90 DAYS.