Are you using the correct manual for your version? If your board is version 8.2 then use the manual for serial numnbers 3672 and up. If you have board version 6.x use the other manual. But i’m a little confused because VR10 isn’t shown in picture 70….only VR8 and 9. And R4 and R5 aren’t mentioned in the notes for that part. Maybe try to re-download the manual to make sure you have the latest version. You may see some discrepencies in the photos, as described by the note on page 13.
Anyway, it really doesn’t matter which direction you solder in VR10; for our purposes it is non-polorized. You should still be able to adjust the gain in the same way, no matter which direction it’s facing.
Let me know about the manual you are using.
-Brach