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Hi, if the trunk won't pull down tight you probably have a leak in the trunk lock mechanism. You can remove and reinsert fuse 71 for the PSE module and possibly reset the system so that the trunk will lock tight. The fix will only be temporary as the PSE module will disable the trunk closing if there is a leak in the lock in order to protect the module. Fuse 71 is located in the fuse box under the stowage box behind the passenger seat.
Let me know if you have any questions.