318 LA rebuild after losing a valve seat

Thanks Kim, everything appears blemish free and the rings are new. BUT...I was giving the drum one more inspection before launch, and something caught my eye. 0E84763E-65BD-4E50-8017-5C0F77A1404D.jpeg
So I separated it and found this.
2460DF13-28DD-4729-B57B-6473B117B1CF.jpeg 098972CC-BCE0-484C-982B-0745115E7730.jpeg

Back to the shop I go...to replace whatever that was that broke. Dammit.