What was found
AFTER GETTING INCOMING CALL ON SATCOM. SATCOM MENU ON MCDU WAS NO LONGER DISPLAYED. CALL LIGHT ON CENTER PEDESTAL FOR SATCOM IS CONTINUALLY ILLUMINATED. CHIME FOR HF SELCAL SEEMS TO BE INOP. LIGHT ILLUMINATES ON SELCAL PANEL, BUT NO CHIME. ACFT GROUNDED. CHECKED SAT AND SELCAL CIRCUIT BREAKERS, GOOD VDC AND NO IRREGULARITIES NOTED, REPLACED SAT CIRCUIT BREAKER AS A PRECAUTION IAW WDM 23-15-11P901, 22-22-11, AND 24-61-21. SATCOM OPS NORMAL REF MM 23-15-00.