Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 12°C. We apply continuously 84°C heat to the field 8x6
What is the temperature (rounded to whole numbers) in the field 6x5 after 137 iterations according to the Gauss-Seidel iteration

Field in the beginning

12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212

Field after 4 iterations (rounded after 4th iteration)

2334444431
3567777652
3688999864
478910101010106
47910111113182214
47910111319345428
479101114265713748
4689101322385730
356781014212515
12344579106

Temperature in field 6x5 after 137 iterations: