When the interior light flashing, check all doors, they might be open or not shut tightly.
yes, some adjustment required, might need to change some mounting points, but i've done it
I have an estate, so the procedure might be slightly different on a hatchback, but not by much. The rear light cluster is attached via a screw behind the facia panel at the back. You will need to remove the plastic panel in the boot behind the light cluster and unscrew the unit before you can remove it to change the bulb.
you might need to change the battery
This means that you might have an issue with the vehicle. Stop the car and see if there is anything out of place.
You might need to replace your thermostat.
Should fit pretty much as is, might need to change / up grade mounting bushes/components. don't forget the ecu's tho....
This can sometimes be a difficult task. It might be best to use the users manual or get some assistance before beginning.
It might appear they do, it depends on the light changing.
This is a chemical change.
It might be called photo-chromatic aberration.
You have to change the service light because there might be dust in the suction thingy that holds the light, and if its not that, you have to replace the wiring.