The service on the transmissions is a simple drain and fill. I would suggest going with the factory DW-1 fluid, however many others have done their own blend, so YMMV. At 55k miles, if the trans hasn't been serviced, I would do it soon.
I can't say about any open recalls or TSB's. If I remember, you can sign up for Acuralink (or whatever the hell it's called now-a-days), plop you VIN in there and it should bring up TSB's.
Thus far, there hasn't been any programmers to date that can adjust how the transmission mapping. I think Hondata had recently released Flashpro that will work on some of these cars, however, it can only do engine parameters.