What was found
ON STATUS PAGE CANNOT ERASE SATCOM HIGH GAIN. RESET SAT COM C-B'S AND SAT COM BITE TESTS OK MADE SAT COM RADIO CONTACT TO SAMC. ALL LOUD AND CLEAR. MADE SEVERAL CALLS TO SAMC, SYSTEM OPERATED NORMALLY. BUT AFTER ABOUT ONE HOUR ON THE GATE GOT "SATCOM HIGH GAIN" EICAS MESSAGE. RESET OF SATCOM CB'S=NO HELP. ALSO HAVE "RFU" FAULT ON BITE PAGE WITH "SAT INOP" ON SATCOM MAIN MENU. ACARS DISPLAYS SATCOM AS "NO COMM". SATCOM CONSIDERS INOP. REOPENED ON 31JUL11 FOR: REOCCURED. REPLACED RADIO FREQUENCY UNIT (RFU).