Clutch slips through!

Hello all! It’s about a 2002 Iveco Eurotrakker 440hp, 200,000 KM run! Well loaded the last two gears a little bit through, I turn the previous gear a little higher and then take the next (and thus minimize the speed difference) is better. For me as a bureaucrat this sounds like the first signs of a worn clutch. However, I wrestle the car DIRECTly if I want to drive the car in 6 or 12 gears in the stand. of course, I can also send the driver to Iveco, but they are guaranteed to install a new clutch directly without even thinking about it… I found that it makes sense to listen to it before you release a repair order >2000€…