Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 40°C. We apply continuously 128°C heat to the field 5x9
What is the temperature (rounded to whole numbers) in the field 5x0 after 79 iterations according to the Gauss-Seidel iteration

Field in the beginning

40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040

Field after 4 iterations (rounded after 4th iteration)

6912131314131295
916202223242321168
12202528303030272011
13222832343434302312
13233034363636322413
14243034363837342513
13233034384241352613
12212733445549382613
9162234578961392311
591428671846931156

Temperature in field 5x0 after 79 iterations: