How to tackle error raised in 1 WFE out of 3 WFE?

Someone had asked this question but proper answer is not known, can anyone say what will be the proper answer for this? We have a SharePoint application spread on 3 WFE server. Now one component is creating trouble in only one specific front-end server, not in other 2 WFEs. So error is in 1 WFE while other 2 WFE are fine. How to tackle this situation? What steps we should take in this case?