Pesachim 12a - How Long After Alot Hashachar is Netz? Tosafot (11b) vs Gr"a, Understanding the 7 Chakirot Done on Eidim - Dec 14, 2020 - Pesachim Daf 12a - Shiur #46
Tosafot on 11b DH אחד אומר בשתי שעות explaining why we cannot infer that when a person testifies in the 2nd hour he means it took place before Netz, the Gr"a's disagreement with this Tosfot. Biur HaGra O"C Siman 459 DH "VeShiur Mil"
Chidushe HaRan on תנן: היו בודקין אותו בשבע חקירות - Opinion of R Zerachia HaLevi.