Hi, I have a Loewe Aconda which has started to exhibit a 'flare' of mainly green, but sometimes red as well when you switch off. I.e. it goes through the normal closing curtains, but then has a lingering hot spot in the middle for a few seconds. Is this something serious? The power pack went a few weeks back and the service centre that fixed it said they has to do some geometry re-alignment, could this be the cause, or is it something more serious?