Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 8°C. We apply continuously 71°C heat to the field 8x1
What is the temperature (rounded to whole numbers) in the field 5x8 after 123 iterations according to the Gauss-Seidel iteration

Field in the beginning

8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888

Field after 4 iterations (rounded after 4th iteration)

1223349203618
234458174311138
24566916304624
34667913182213
3567781012128
3567789985
3567788863
2456677653
2345555432
1222333221

Temperature in field 5x8 after 123 iterations: