And make sure the shop uses 0.1mm inlet and 0.15mm as the clearances, regardless of what they believe the factory says.
My advice would be find another local Grisisti who can take you through a tune up. It's not hard to do and if you learn it will always be right.
If you'se blokes want a walk through? As long as you have the tools I'll make time in early October and come and walk you through it.