Hi ibboyle. We're not ignoring your posts, I have a feeling this is a query some of the guys don't have an answer for.
The Cambelt, there were some issues identified with the is that Lexus brought the time to change it forward from 100,000 miles, to 60,000. If yours was last done at 80,000, then I think you're about ready to have it done again.
Squeaky noise could be something rubbing against the wheel, certainly if it gets louder at speed.
Sorry I couldn't be more helpful, but it may be worth getting the car to a garage, unless you're competent to do the work yourself . . . I'm not, so I go to the garage.