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 150°C heat to the field 7x5
What is the temperature (rounded to whole numbers) in the field 5x7 after 69 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
3567777753
3688991114127
4789101424362814
47910132555945927
4791117389624410039
479111632641036631
46810132237493820
356791420242011
12345791095

Temperature in field 5x7 after 69 iterations: