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Call your dealer and ask about the Volvo Software for Life program, or something to that effect.
I'm in the Toronto area in Canada-- my local dealer did the software update for free, which included up to an hour of computer diagnostics (essentially reading the OBD II codes). The service writer added rough shifting to the notes for the tech.
You can read the codes at a parts store, but only the dealer can update your software, which is what I would do second after changing the fluid to proper JWS 3309 spec. Don't drive the car too much in limp home mode-- it's not good for it. The dealer will also reset the adaptations, which is done using proprietary software (you can get Volvo VIDA for under $200 if you want to do this kind of stuff).
I can relate to your experience-- I'm a recent convert from 760/240/940 ownership-- these cars are a breed apart!
Good luck!
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