+1 on the transmission flush. its a diy though. get two cases of transfluid, take the top hose off the line that runs into the radiator, start engine and drain about two quarts of fluid into a bucket, add two quarts and repeat till the fluid runs a nice clean red. i use to do this on my 855 every 15k miles. it only take about an hour or so depending on available help. i still have about 3 or 4 sets of the replacement grommets and clips if you want them shoot me an pm. i also have some other stuff too but mine was a 94NA so some may not fit. the brick board is a great resource and bay 13 outlines the procedure for alot of the stuff like a stripped seat back cable.
AWD - The Volvo Owner's Resource
Bay 13