As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM IS NOT MAKING CALLS. GROUNDED - YES. PERFORMED SATCOM COMMUNICATION SYSTEM VOICE TEST REF B737-800 AMM 23-15-00-730-801. CALLED DISPATCH ON SAT COM 1 AND SATCOM 2. SUCCESSFULLY ESTABLISHED CLEAR TWO-WAY COMMUNICATION ON BOTH. OPS. NORMAL. NO FAULTS NOTED.