My ae700e has started having two horizontal blue streaks on the right hand side of the screen. It isn't always apparent but seems to appear after being on for several hours. If you pick a blank input you can see a pronounced 'ripple' as it is the same blue as the blank screen. It seems to be getting worse as I'm writing this It is really annoying as I bought a new bulb a few months ago as the current one was getting up to 1500 hours and they often pop not long after. If I'd known it would do this I wouldn't have wasted £160 on a cheap replacement bulb. What is likely to be the problem and are the parts cheap to replace?