So are you facing air loss or gain??
I have no clue how you could gain pressure (only 'possibility' i can think of is when you check air on a cold tire and then when its warm.. a warm tire will show a higher pressure reading)As for a leak, there can be a few sources.. tire, valve, rim. A drop of around 2 psi a week is ok.
A good way to spot an leak is my immersing the entire rim with tire into a tub of water and slowly checking by turning it around. A friend recently sent me a video where there was a tiny pin hole in the rim of his 'non-accident' ktm and the air was leaking.





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