You can't tell the OS version just by looking at the Pearl, so unless they go looking, and shouldn't for what sounds like a hardware issue, I wouldn't be too concerned.
I was on a support call w/VZW on an issue, and the agent asked me if I had tried upgrading the OS. So I don't think that they believe that is something their customers have to avoid.
You are more likely to get into problems if they know you "pulled it apart" - that's the kind of info you should not
share with them.