Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 26°C. We apply continuously 156°C heat to the field 2x5
What is the temperature (rounded to whole numbers) in the field 2x7 after 40 iterations according to the Gauss-Seidel iteration

Field in the beginning

26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626

Field after 4 iterations (rounded after 4th iteration)

4688999863
610141516161514105
815232423222018137
1229464235292521158
23601077751372924179
3510326312066433225189
28691168557413225179
1941595343342722158
1123313228242016115
5101415141210863

Temperature in field 2x7 after 40 iterations: