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 86°C heat to the field 1x2
What is the temperature (rounded to whole numbers) in the field 0x3 after 109 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)

9171410755431
2552352214108753
461386031191411963
295842281915121074
162827221714121084
91618171514121184
61113131313121084
581011111110963
3578888652
2334444321

Temperature in field 0x3 after 109 iterations: