I was concerned to read this as I am also in the middle of slam panel removal to remove fan shroud to get access to the aircon condenser. I have just tried my torx screws. The right hand one looked ok and it came out after gentle back and forth tightening and untightening and a bit of penetrating oil. The left one looked a bit rusty and the torx head was not exactly snapping in nicely but I heard a healthy rust crack with gentle pressure and then after the same similar back and forth treatment it came out unscathed (unlike one of my headlight bolts which sheared off but at least I have three more fixings!). I then tried all the other bolts for the other attachments to the slam panel and they are all moving ok. Phew!
