As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO MAKE SAT CALL ON NR 1 OR 2, INIDATED "ANSWERED" BUT COULD NOT HEAR ANYTHING. ACFT GROUNDED. ACCOMPLISHED SATCOM SYSTEM TEST IAW AMM TASK 23-15-00-730-801. SUCCESSFULLY MAKE OUTGOING AND INCOMING CALLS WITH DISPATCH WHILE ACFT IS ON THE GROUND.