Hi
Your handbook will tell you the fuse for the boot release prob a red 10 amp .The indicators normally flash when the double central locking is engaged .If you open the tailgate on it you will find 3 prongs and on the rear panel a flat plate these are the electrical contacts for the boot release among other things try cleaning both .The bulb on the dah board should come on also if the bonnet is open if it does than a switch in the door is faulty,