Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 10°C. We apply continuously 85°C heat to the field 4x9
What is the temperature (rounded to whole numbers) in the field 9x7 after 138 iterations according to the Gauss-Seidel iteration

Field in the beginning

10101010101010101010
10101010101010101010
10101010101010101010
10101010101010101010
10101010101010101010
10101010101010101010
10101010101010101010
10101010101010101010
10101010101010101010
10101010101010101010

Field after 4 iterations (rounded after 4th iteration)

1233333321
2456666542
3567787753
3678898863
3678999863
368991010863
36710121211973
359152219141073
2512274831181063
2513391174117842

Temperature in field 9x7 after 138 iterations: