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 136°C heat to the field 5x4
What is the temperature (rounded to whole numbers) in the field 5x5 after 139 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)

3566777752
58101114171714105
610131728403425168
6111629569465402311
712204194231103532813
71320366610473462713
7121828435548352311
611152128333125179
58111417201916116
2467899853

Temperature in field 5x5 after 139 iterations: