I’m surprised if they do suspect an injector issue that they aren’t actually checking them by looking at their leakdown rate. All that means is they activate each injector individually for a short time (5 sec. or whatever the spec. is) and measure how many PSI the fuel pressure drops in the system. They compare the 4 results to the spec. (or to each other), and see if there is a problem or not. If one is leaking that would be pretty obvious. I would think the test is faster and more conclusive than swapping them around.
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