i am not gonna bother had the same thing happen and have still to find the courage to follow one diy here that mentioned to simply remove 2 torx screw from the side channels that the rear glass sits on, and then do a full -resync of glass this means you only have front half of pano working but better than nothing

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N