What was found
SATCOM INOPERABLE BOTH SAT 1 & 2 GAVE "NOT READY MESSAGE BEFORE FAST BUSY WHEN WE TRIED TO CALL DISPATCH. GROUNDED-YES. VERIFIED DISCREPANCY WHEN WE TRIED TO CONTACT DISPATCH ON EITHER 1 OR 2. SATCOM LRU LBT-1 SHOWED AMBER LED, LBT-2 SHOWED AMBER/GREEN. CYCLED SATCOM C/B AND ACARS C/B, DISCREPANCY CLEARED. SATCOM "MAKE CALLS AND ANSWERED" DISPATCH CALLS, REF B737-800 AMM 23-15-00 ON 1&2. ACARS SATCOM LINK STATUS GOOD. ACARS SYSTEM VHF LINK TEST GOOD, REF AMM 23-27-00.