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 166°C heat to the field 1x7
What is the temperature (rounded to whole numbers) in the field 5x3 after 148 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
3689999863
612141211109863
18353122161311963
46976538231612973
8526010852281712963
501026940231410742
213831211385421

Temperature in field 5x3 after 148 iterations: