Those are 2 different coils. One is hwh, and the other is chilled water. Those aren't pinholes, all the repairs were splits due to freezing. We fix them because we can, and it's easy. One froze cause a damper stuck open, and the other was cause we lost steam.Why are you brazing that old coil? it looks like it's on it's last leg if it's got that many pin holes. How did you end up with that split? Is it a hydronic coil that froze?