WIS is the official saab software with the detailed workshop ("step by step") instructions for mechanical repairs .
there is both a WIS ( "workshop information system" ?) and Electronic Parts Catalogue (EPC) software available online for saab 9-5's (the same software contains all the saab models info from early 1990's i think, up to the last 2012 models) . the older version of WIS and EPC ran only from winXP , but up to win7 you could easily run a virtual machine in xp mode to still use it. more recently a clever person has modified the original software so it now also runs directly in win 8 and 10 without having to install a virtual XP mode
do an online search for the latest version of the WIS and EPC , it will help you a great deal when doing your own repairs