PS3 not reading discs

[Blufury]

My PS3 was working fine until about an hour into Jumper (yeah, crappy movie I know). The movie played fine and then suddenly froze. I couldn't go back to the disc menu, so I ejected the disc and tried again. System wouldn't read the disc. I turned off the system and turned it back on to try again. Disc worked for about five minutes and then froze again. I put in Wall-E and MGS4 and both were not readable. Jumper worked fine on my Samsung 1500p. I have a 40GB model. I updated to the latest firmware, 2.53.

Did my system just crap out? This really sucks because I haven't owned it for a year and have watched less than 100 Blu-rays on it. Played a handful of games...no dvds or cds ever played it in. System is on a shelf, elevated about 3 feet off the ground. Is there some way to open it up and use compressed air to clean it? I'm thinking the lense may be dirty (dust I imagine).

Any help or advice would be appreciated. Thanks.