I had a small argument with my wife about this yesterday, so I thought I would ask people who know better. Three weeks ago I changed the rear tyres on my 2019 Mitsubishi Pajero Sport at a shop near my office, after one of them went flat and the other was already worn. The car has about 92,000 kilometers. Since the change, the left rear tyre seems to drop a little pressure every few days. Nothing dramatic, maybe three or four psi in a week, but I only noticed because the warning light came on once in the morning. My wife says I should go back to the shop and complain. I told her it might be the weather, because the days are hot and the nights are cooler, and I have heard air pressure changes with temperature. My brother says it could be the valve, and that some shops reuse old ones to save money. A colleague says it can also be the rim edge, where the tyre sits, if it was not cleaned properly during the change. I read a page from a workshop in Sharjah about tyre problems, and it explained that a slow leak can come from the valve, the bead area or a small puncture, and that a proper check includes putting the wheel in water to see the bubbles. I never thought about that. Since I work near the industrial zone, I typed Expert flat tyre replacement service in Industrial Area 11 into my phone one evening, mostly to see what a good shop should do for a job like this and whether they fix their own mistakes for free. So here is what I want to ask. How much pressure loss is normal in a month, and how do I know if it is more than the weather? Should a shop change the valve every time they fit a new tyre, and is it okay to ask for that? Also, if the leak is from their work, is it fair to expect a free fix, or do they usually say it is a new problem? One more thing, do I need the wheel balanced again if they open it a second time? If you had a slow leak after a new tyre, please tell me what the cause was and how the shop handled it. Thanks everyone.

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