Yashica tlr screen

Does anyone know if the Yashica 44 LM view/focus screen is a 1 or 2 piece unit? Mine appears to have dust spots, but they are not on the top or bottom surfaces. At this point, I haven't taken it out of the folding hood.
Thanks for any input.

Gerry

Got it handled.

How did you resolve it?

I removed the screen from the hood assy and found it has an upper & lower screen. The lower has a fresnel surface facing up. Lots of dust in between them.