OK folks, I managed to replace the bulb. For those that may need to do same in future you can use the following method. If you look in the mirror section of the service manual in the Aurion FAQ section, it shows how to remove the mirror with a pulling tool. I just pushed the lower part of mirror as far in as it will go, that way it gives you enough room to put your fingers inside the top of mirror, grip it and gently pull it out, it pops out pretty easily. After pulling the mirror out, this gives you all the space you need to see where the rear plastic is held by clips, gently unclip each one of them with a flat blade screwdriver, and out pops the rear plastic cover. Make sure you are holding the rear plastic cover with one hand while popping the clips out otherwise it will just fall to the ground and get scratched or damaged. After removing the rear plastic cover, you now have access to the 3 screws that hold the plastic housing for the bulb, these are torx security screws, I used no. 15 size torx screw driver to remove them. Then just pull the bulb out from the housing and replace with new one or an LED type. The bulb is a standard size T10 5watt orange coloured type. Installation is a reversal of above.