I am looking for two case screws for my tsu-1000. I somehow lost one when I replaced my screen over a year ago, and now another one is missing. I tried some local shops with no luck, so if anyone could direct me in the proper direction, I would greatly appreciate it. Thanks in advance:)

btw, ever since I replaced my screen a while back, I hear a mild buzzing noise when the screen is activated and there are some dark contrast blotches around the edge of the screen. Does this seem to be the result of an improper install by any chance, or does it sound like a defective screen?