Front end is making "squeaking" noise, over bumps and uneven payment.

What is your question?

Had problem 2 months ago, and the dealer replaced upper right/left front control arms. Costs me like $1800. Took truck back for an unrelated burning smell 30 days later, and they replaced valve cover gaskets (another $700). Shortly after that, the "squeaking" noise came back and is worse than before. They now want to replace lower control arm bushings - don't have a price for that yet. I'm wondering if they misdiagnosed the original problem or should have replaced the lower bushings while they had the whole front end control assembly apart - rather than sticking it to me again? Thanks for any input. Greg