I have the SERV TPM sensors light on

I took it to the tire shop and they said they are not able to fix it.

They put new TPM sensors on all the tires and reset the computer.

Would like to know what i can do to fix the problem.

Often when the truck is first warming up but occasionally when I've been driving for a while, the front end will make a noise like a creak you hear while walking up a set of old barn stairs as I crank the wheels to turn the truck. It is more likely to happen when I make a tighter turn. Is there something that needs to be greased or is it just a sound from something flexing oddly?