I don't know , but have heard that these cracks are common. Does this warrent a new head ? Need help. Thanks
YOU DON'T NEED A NEW HEAD! That shop obviously isn't used to working on diesels, I wouldn't trust them. I'd have a diesel shop work on your head instead. 99.9% of vw diesel heads will have those cracks between the valves, it's 100% normal.
If they argue you need a new head because of those cracks, tell them to **** off. I've seen several diesel heads, all of them had those cracks.