I have seen the tsb for the rattle but not for the sinking dash. From what I can see it should help with the sinking issue as well. I have not run across the issue in person. The entire dash does not have to come out, just have to pull back on the right side after loosening it up. It can't be to hard it doesn't pay that well.

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08 Tundra DoubleCab,
4X4 SR5,
Prodigy Brake Controller,In Channel WindowGuards,20% Window Tint,TRD Cold Air Intake,All Weather floor mats,Diamond Plate Toolbox,OEM Backup Camera W/ flip down screen,
2.5inch leveling kit,Firestone airbags,Alluminum skid plate Underseat Storage 305 65 18 BFG All Terrains