Turbo models do not have a PCV valve (a "flame trap" in Volvo

nomenclature). Not sure what they are servicing there.

(Unless 94s are different.)

There is a common problem with a leaking vacuum line that is

difficult to get at and I recall the problem is under the manifold.

I wonder if they found this and they take off the manifold

to service it? Perhaps this is what they are calling a PVC service

(or repair)? I know others have fixed this common problem

themselves, hopefully someone can post details. You could also

search the archives for vacuum line problems. Still, I would

double-check why they are doing this.

See:

http://volvospeed.com/Repair/vacuum_lines.htm

for info on tracking down vacuum line proeblems. It covers the

common problem I mentioned. The site also covers flame trap

service for the normally aspirated models and other common repairs.

Look the site over -- it will save you some money with common repairs

and service.