As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATTEMPT TO CALL MEDLINK ON #2 SAT FAILED. CRUISE ALTITUDE 34,000' MODES: READY, MAKE CALL, DIALING->THEN STRAIGHT BACK TO READY. GROUNDED - YES. REF LOG 60222568 AFTER ADJUSTING OBS ACP, SAT COM #2 OPS NORMAL FROM MEDLINK SYSTEM REF B737-900 AMM 23-15-00.