Here’s an observation . . .
Many of the factory service checksheets say something to the effect of “rotate the tires, as needed” or 'rotate the tires, if necessary"
A lot of mechanics will look at them and say “All 4 tires are wearing evenly. I won’t rotate them.”
That said, customers that verbally instruct the service writer to have the tires rotated, got the results they wanted. Because there would be an extra notation on the repair order.
Not to mention the customers who had those silly . . . IMO . . . McGard wheel locks, but didn’t bother to tell us where they put the tool. It was almost never in the trunk, along with the factory tools or the jack. Some customers put them in the glove box or center console. Some admitted they lost them and/or couldn’t account for them. Some actually kept them at home, as if that’s going to do anybody any good. One guy even put the tool in the factory first aid kit. That’s about the last place anybody would think to look.
Anyways, if the mechanic spent a reasonable amount of time looking for the tool . . . reasonable being 5 - 10 minutes, IMO . . . then the service writer was asked to call the customer. If the customer didn’t pick up or call back within 10 minutes, forget it. No tire rotation. But even if the customer picked up or called back, it was often a waste of time, because they didn’t know where the tool was, or that there even was one.
Another obvious problem was that it wasn’t always easy to inspect brake pad lining thickness if you couldn’t remove the rims from the car. Even with a mirror, on some cars, it was almost impossible. Measuring rotor thickness was also not easy.
As for that ATF in the car without a dipstick . . . the most obvious thing is to look on the invoice to check if the fluid was actually charged out. Beyond that, you’re going to have to decide if you want to go to the trouble of checking for yourself whether the fluid looks fresh or old
You don’t need special tools to merely check the level, but adding fluid won’t be easy. But the fluid is checked at a specific temperature, and that’s where the scan tool would come in. And the knowledge of what that specific temperature is. Sure, my scan tool will probably show me the flluid temperature on the most common transmissions, but I can’t guarantee it’ll tell me what the temperature for checking should be.
You’re going to have to spend time and/or money to prove that a shop did not change the atf.