What was found
ON BOTH OUTBOARD PRIMARY FLIGHT DISPLAYS TO THE BOTTOM RIGHT OF THE ALTITUDE DISPLAY A YELLOW "LDG ALT" "FLAG" IS DISPLAYED. NOT SURE IF FOLLOWING INFO IS RELATED OR NOT: WHILE EN ROUTE DUE TO WEATHER REROUTE WE CHANGED FROM ROUTE 1 TO ROUTE 2 ACTUATION. MAINTENANCE & DISPATCH NOTIFIED VIA SATCOM AT 0740Z. AT 0810Z "LDG ALT" FLAGS CLEARED - NO PILOT ACTION TAKEN - SELF CLEARED, NO LONGER DISPLAYED. ACFT GROUNDED. PERFORMED FIM 34-60 TASK 801, NO DEFECTS NOTED.