My [component] broke while I [was doing something]. How do I fix it?

Including:

or any other part/modification

This is essentially identical to the installation question, above.  If you are having problems with something that you believe is unrelated to your modifications, also check out the NHTSA recall information, and the TSB page to see if there is a Technical Service Bulletin (see the Glossary) about the problem.  Don't forget the FAQ locator, and take a look at David Gawlowski's Turbocharger Troubleshooting diagnostic chart for a good look at some common problems and their causes.