Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 15°C. We apply continuously 156°C heat to the field 7x5
What is the temperature (rounded to whole numbers) in the field 5x2 after 128 iterations according to the Gauss-Seidel iteration

Field in the beginning

15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515

Field after 4 iterations (rounded after 4th iteration)

2445555532
4678999874
4791111111416137
581112131728393016
5911131629591006329
591113204210225610541
5911131936681097033
581012162540534021
3689111622262212
234568101195

Temperature in field 5x2 after 128 iterations: