Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 20°C. We apply continuously 74°C heat to the field 2x0
What is the temperature (rounded to whole numbers) in the field 5x2 after 30 iterations according to the Gauss-Seidel iteration

Field in the beginning

20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020

Field after 4 iterations (rounded after 4th iteration)

12361053918118752
122949342317141184
1021302723201714115
916222322201816126
814182020201917127
713171920201917137
712161819191816126
611141516171614115
5810121213121184
2456676542

Temperature in field 5x2 after 30 iterations: