Just check the rear bulkhead is sitting flush on to the chassis. It's worth just taking a tiny bit off the back of the chassis to ensure this does happen as some of the bulkheads are slightly different where they seat, only a tiny bit but it's a close tolerance in there. Pretty sure it shows in the manual to check this. You can download them if you don't have one.
Not ever known of a chassis to tweak.
E.
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