WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Lower Cover Inner And Outer Screws
Courtesy of VOLVO CARS OF NORTH AMERICA.
Remove
screws (2 x Torx 15) from lower cover outer holes.
screws (2 x Torx 25) from lower cover inner holes.