2004 S80 T6 Transmission Slipping

[user13]

Hey everyone, I need some help. My car has 130K and my transmission started slipping about a month ago and has gotten progressively worse. I have not gotten any system warning and my mechanic said nothing came up on his computer at the time. I then took it to Volvo to get the software update but it did nothing. However, after the update the computer at my mechanics shop showed solenoid S1 had an issue. The thing is we both cant find any images for this transmission to find out where it is located.

Any advice would be very helpful

Thanks