Eureka! I think I've solved the mystery "top bulge" problem myself (no thanks to the dealer tech who was dumbfounded, and called Nissan before making any real attempt to diagnose the problem himself). He said, "well, there's no access to the interior of the top, so my initial call to Nissan suggests that we'll have to replace it." WRONG!...got to thinking last evening, and lowered the top just half way to reveal a full open view of the area in question. The culprit is a nylon pad/guard (as expected) that is velcroed to the top fabric to cushion it from a plastic rail clip assembly below. My guess is that the bulge occurred when the pad got caught on the back edge of the clip, and then eventually freed itself and returned to normal. There's another nylon guard that runs the middle length of the frame rail, and it may have been a catch point as well. Made a few adjustments, and so far so good. Can't begin to express my sense of relief, but now wonder if I should trust the dealer even to do the Free first oil change. The "top" issue didn't exactly inspire confidence.
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