40k tuning is just a fraud. Oil + Oil filter + Air filter will be the replacements if millage is completed for oil change. Never allow them to mess up with any setting of the engine. Never go for throttle body cleaning. Inspection of brakes and under body can be done but they will charge a hefty amount for that. Checking of brake Disks and Drum can be done from any road side workshop.
Only opt for the repairs of the things that are broken. If every thing is fine no need for repairs.