Is it an absolute? Probably not but most likely recommended. If you have a quality shop to look it over, unless your comfortable looking it over yourself of course. Check the bow for factory settings, ie the brace height, tiller, poundage etc.. to see if the string/cables have crept. (stretched).

Check for broken fibers in the string/cables themselves and a really good waxing would be in order if you decide to not replace them.