Hi Ruben, crumbs that's a hefty price...I suspect the dealer will be removing the dashboard to acquire proper access.
Those servo's and connecting rods are a royal pain, especially if you split the passenger (UK) side.
I can't recall the full details of my alignment but I do remember that I had to work each rod on the heater box to understand it's use and then relate that to the servo operations from the dash controls. I had the server panel removed at this point so it operated freely. You should then gradually be able to orientate the parts so they mesh together and work throughout their range without binding or interfering with other controls.
I'm not familiar with the IS350 servo's layout, is it the same as the GS?
How far have you got thus far?
What was you underlying issue, a worn servo? Noisy dash on initial start-up?
Cheers, Lee