Its due to a revision to the product, where the 3 top bolts with seal washers were changed out to studs, to ease assembly. Using studs instead of bolts gives the fuel opportunity to travel up the inside of the thread, between the point of the male thread, and the V of the female thread. Thread sealant is required on these 3 studs.
This step was forgotten in the installation manual, and I have been asked about it a few times. It is nothing out of the ordinary... luckily it only takes a few minutes to address it.
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