Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 15°C. We apply continuously 141°C heat to the field 9x3
What is the temperature (rounded to whole numbers) in the field 3x6 after 142 iterations according to the Gauss-Seidel iteration

Field in the beginning

15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515

Field after 4 iterations (rounded after 4th iteration)

2445555566
4678999111821
47911111113234364
5811121313183579193
591113131419305067
591113141517232927
591113131415171813
58101112131313127
3689999974
2344555432

Temperature in field 3x6 after 142 iterations: