We test all FICM's before working on them. If a FICM is not damaged, it only gets worked on if you expressly want it upgraded. We have seen plenty of cases where a module had an issue, but the issue it had wasn't causing the symptoms that a truck was experiencing (meaning that the truck actually had more than one issue!). If we repaired your module, we cannot be responsible if your non-FICM related symptoms continue.
If you have any question whatsoever as to whether your FICM is the root of your issues, please contact us prior to sending in your module. We would be happy to troubleshoot with you!
Of course, if we did an exchange with you, we never saw your old module ahead of time. If you wanted to return the exchanged module, see the returns question below.