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 89°C heat to the field 2x2
What is the temperature (rounded to whole numbers) in the field 9x2 after 136 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)

41219161186542
12325739241612963
1957148663522161284
163966483223171395
1124353226211714105
816222321181614105
612161717161513105
5912131414131184
4689101010863
2345555431

Temperature in field 9x2 after 136 iterations: