Quote Originally Posted by dugrant153 View Post
Thanks for that. I'm going to try that out later tomorrow when I go check it out again.
It is highly possible that focusing screen is malfunctioning !

Here is my case - upon receiving one F5 I dismantled focussing screen.
After reassembling it some focusing points on screen were not visible,
but that on viewfinder sides were ok.
Replacing it with another everything was ok.
On KEH replacement screen is under 20$.

But from your original post it is not clear which AF points are problematic - that on viewfinder sides or on the screen?