What was found
SATELLITE PHONE NOT FUNCTIONING PROPERLY. YOU CANNOT TRANSMIT OR RECEIVE ON SAT 2 WHEN TRYING TO PLACE. A CALL UIA SAT-2 ON THE MCDU W/ SAT 2 SELECTED ON AUDIO CONTROL PANEL YOU CAN PLACE A CALL VIA SAT-1 ON MCDU, BUT THERES NO TRANSMIT OR RECEIVE FUNCTIONALITY W/ SAT 1 SELECTED ON AUDIO CONTROL PANEL. IT ONLY WORKS TO TRANSMIT OR RECEIVE W/ SAT 2 SELECTED ON AUDIO CONTOL PANEL. GROUNDED - YES. PERFORMED MAINTENANCE CALL TO "DISPATCH A" ON SAT 2 PER B737-800 AMM TASK 23-15-00-730-801. RECEIVED CALL FROM SEA LINE MX OFFICE LAND LINE AS WELL. OPS CHECK GOOD. SUSPECT INCORRECT CONFIGURATION.