Belly cracks on yew bow

[Will B]

I have a rawhide-backed yew recurve that I was finishing with tri-oil and noticed two hairline cracks on the belly about mid-limb. They are in an area with a cluster of pin knots on the top limb. I only noticed them after putting a couple coats of finish on the bow. I have about 200 arrows through the bow.
My question is should I sinew wrap this portion of the limb, shoot the bow as is and watch them, or??

Thanks for your thoughts.

[Will B]

One more picture

[Pappy]

Look like drying checks to me, not frets, I might fill them with thin glue but honestly if they don't go through the limb or run off I
 the side I would just keep an eye on them to see if they get worse, don't think it will be a problem. Beautiful piece of wood.
 Pappy

[Will B]

I was hoping they might be drying checks. I will follow your recommendation and keep a close eye on it. This portion of the stave has some deflex and a cluster of pin knots that I tried to leave stiff while tillering. Thanks Pappy