Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 22°C. We apply continuously 78°C heat to the field 5x3
What is the temperature (rounded to whole numbers) in the field 7x7 after 148 iterations according to the Gauss-Seidel iteration

Field in the beginning

22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222

Field after 4 iterations (rounded after 4th iteration)

356791110863
59111420272418126
611152339614429188
71219316214167382210
7131929476951352211
7131925344237292010
713172226302824179
712151821222219147
5911131516151395
3567888752

Temperature in field 7x7 after 148 iterations: