I don't have access to the AMM as I no longer work the 767. However I'm curious as to how a dry motor would be sufficient to check the fuel filter for leaks? An oil filter I could understand, but you need to pressurise the fuel system in order to check for leaks. So unless you open the fuel cocks (a wet motor or idle run) I don't see that you're checking anything!
On the initial subject, I must confess I would have thought the filter should have been checked (replaced) at the first instance. It's not as if it's a difficult job.