Ridzhao posted a thread a while ago for fitting a new bootlid and he had pics and instructions for the trunk release. The actual post might be on e90post.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18