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 81°C heat to the field 6x3
What is the temperature (rounded to whole numbers) in the field 4x9 after 131 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)

4688910121184
610131417233025178
8131620274365462813
81419243668149703616
9152025355274533316
9152024303946392714
9152023273133302211
814172023252523179
610131517181816116
3578999863

Temperature in field 4x9 after 131 iterations: