Crack in soundboard

Howdy,

I know that this topic has been covered several times, but I also know that the repair depends on the type of crack.
I bought this guitar several years ago. I was out of town and didn't have a guitar with me, so I went to the nearest pawn shop and picked it up for $40. It was cracked when I bought it, but I didn't think much of it. It still played fine, and it was just to get me through a couple of nights. However in the last few years I have grown quite attached to this guitar. It's the one that I play almost all the time. I just need to know the best way to fix these cracks. Or do they need to be repaired? I have heard that cracks along the grain really aren't that problematic.

I do have a bit of experience repairing guitars. I do all the work on my own, and have worked on quite a few guitars for other people. I am confident that I can fix this one, I've just never repaired a cracked soundboard before.

As shown in the pictures, the cracks are in the soundboard. They run along the grain and extend from the sound hole to the butt of the guitar.

Thanks for your help
Dave