It may be of no relevance to your problem as I don't know anything about your car. However I'd like to tell you about an experience that I had with my car. I too had the service required message on the display. On my car, a C70 MY2006 there are two buttons/knobs coming from the dash, one for the trip reset & the other for the clock adjust. Everything I looked at on Youtube was telling me to work with the r/h button. This turned out to be the clock, so I followed the instructions but applied them to the trip reset and this cleared the service required message. I can only hope that this info will help sort your issue.
Good luck
Fred
