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 129°C heat to the field 3x7
What is the temperature (rounded to whole numbers) in the field 6x1 after 143 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
3688999863
47810111110974
4711151614121184
41021342922161294
61947835634221595
929812119045251594
72351865834211373
4122333271811742

Temperature in field 6x1 after 143 iterations: