Welcome to Matthew's Volvo Site.
There are two shift solenoids in the 4T65EV-GT gearbox. One does the 1 - 2 and 3 - 4 changes the other does the 2 - 3 change. They are the same part number and are accessed by removing the gearbox side cover. That sounds easy enough but the VADIS instructions prove otherwise.
If I have missed any of the "See" bits let me know.
Shop time for gearbox removal is 7.5 hours.
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.