Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 4°C. We apply continuously 173°C heat to the field 3x3
What is the temperature (rounded to whole numbers) in the field 4x8 after 76 iterations according to the Gauss-Seidel iteration

Field in the beginning

4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444

Field after 4 iterations (rounded after 4th iteration)

1148854211
161933271710531
41953100643418952
83310027411150241263
827641117341221273
51734504128171063
4101824221712852
2591212108642
1356765421
1123332211

Temperature in field 4x8 after 76 iterations: