In my condo the stairs have become very creaky. They are covered w/carpet and I am sure they are prefabbed. When I walk up and down the stairs certain steps creak a lot, I don't think they are going to fail anytime soon, but it just not instill a lot of confidence.

How do I fix these stairs ?
1. ) Rip all the carpet off and glue & screw it all back together ?
2. ) Order new set of stairs ?
3. ) Hire a carpenter to patch them up ?

Thanks