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 167°C heat to the field 3x8
What is the temperature (rounded to whole numbers) in the field 8x6 after 119 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)

3566777652
5810111212121084
610131415151513105
611141617171715116
712151719191816126
712182425232118137
716314741322519147
9266210874463020136
1137102268112543018115
82354945933181163

Temperature in field 8x6 after 119 iterations: