Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 7°C. We apply continuously 112°C heat to the field 7x7
What is the temperature (rounded to whole numbers) in the field 7x1 after 142 iterations according to the Gauss-Seidel iteration

Field in the beginning

7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777

Field after 4 iterations (rounded after 4th iteration)

1222222221
2334444431
2345555542
2456666653
24566681085
24566917262010
245681739694320
24561026691807228
234582043724521
112351020282110

Temperature in field 7x1 after 142 iterations: