Get ripped off by Ford?

Hello dear community! Wanted to return my leased Fiesta today at a Ford dealer in Friedberg (Hessen). After the used car test report hit me then! 3099.- € want now from me. Certainly, the car was slightly scratched on 2 sides of other cars on parking lots (120,- and 280,- € damage), but there are items that I cannot understand. System preparation 240,- €. According to the sales consultant’s arrival this is necessary around the car On the statement that the car is well maintained (before washing system, wet wiped out inside and sucked out for hours) I was told that I could not maintain the car at home like with a car preparation. In the leasing contract there is nothing of such costs. I suspect the car dealer or Ford with each flat-rate on it. 350,- € for new tires. Mine have with 2mm too little profile. On the statement that the wear of the tires nevertheless to the leasing agent. ag I was told that Ford did not take back cars with less than 4 mm profile. The lease agreement went over 4 years and 60,000 KM. The tires (full-year tires) had 56000 KM on it. In the lease agreement only it says that the car has to be returned traffic-proof. According to StVZO a car must have at least 1.6 mm profile depth. However, the hammer was the air conditioning. This did not work any more! 1800,- € they want for it. I find that now a little too expensive! Somehow feel I’m going to buy the car now (although the remaining contractual value is still 132,- € sales fee) and sell it privately! Have you had similar experiences? Has the system preparation also been charged to you in general? Thanks for comments! (By the way: in the test report the maintenance condition was indicated as well!) Have you had similar experiences? Is a system preparation invoiced for each one?