ok ya they would definiately know about the access port, every nissan (and almost every car) has had that for decades. i thought you meant they were going to remove it no matter what to either replace it or something like that... but if its just something loose in there then there is no point to removing the tank because they can access the only 2 openings from inside the car anyway.
Theres a couple things I can think of that could possibly break off inside the tank. Let me know what they find!
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