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 77°C heat to the field 9x4
What is the temperature (rounded to whole numbers) in the field 8x9 after 139 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
2456666554
356778781212
36788910152536
367899122144106
368991012182937
36789911141715
357888910107
2456667664
1233333332

Temperature in field 8x9 after 139 iterations: