After a transmission service they're supposed to do a "quick learn" procedure. This puts the shift settings to a know default condition and it will then learn your driving style. In the FSM (Factory Service Manual) there's a procedure for doing the specific gear changes by driving it a certain way
If you don't have a FSM go to the CRD section and read Sam's noob guide even it you don't have a CRD, you'll find a link to a download site
When the transmission fluid is changed the pressure is different and the computer must relearn it's settings. It can take several hundreds of miles of regular driving to relearn so have a look at the FSM
