This sounds more like a Lcd fault than bulb after such a short time after bulb replacement ,however I did have this come up once and the customer had kept his unit in a cold place then took it out to use hence due to the heat from the lamp Condensation dulled the mirrors .After they warmed up all was ok untill the next time solution I told him to store it somewhere warm .. havent heard from him since except for his stereo repair , and you don't want to know what the fur substance in that turned out to be lol
if it is an lcd fault you may find a replacement of ebay a cheaper solution ... Regards Vortash

ps and the beauty of that is you could sell your old unit minus the bulb as spares and repair and get some of your money back you just spent on the replacement .. lol