Don't know that model. Generally you have to take the stand off. If no screws -- look for small gaps in the screen surround edge which correspond to clips inside that release when pressed in with a small screwdriver.
Incidentally, though I'm not sure what the legal position is with a company purchase, the warranty expiry probably isn't an issue. Law in most jurisdictions assumes a consumer durable like this should last a reasonable time -- 5 years would seem about right given my experience of LCD screens. Must be worth talking to vendor -- if only in order to retain goodwill they should be able to do something.