My message board says engine system service required but no check engine light came on and I can't get a reading done unless the check engine light is on according to the shops and auto part stores please help
I've had the same message in the past on my 2007 Volvo V50, and I'd imagine the meaning is the same. This message does unfortunately indicate a potential problem (as you mentioned, there's a different message for regular servicing).
Despite what the shops have said, there probably are fault codes to read. If you really can't persuade anyone to try and read them, you can buy scanners yourself for very little cost.
I found that a bluetooth based OBDII reader combined with the Torque mobile app worked well.