Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 28°C. We apply continuously 151°C heat to the field 4x7
What is the temperature (rounded to whole numbers) in the field 7x3 after 135 iterations according to the Gauss-Seidel iteration

Field in the beginning

28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828

Field after 4 iterations (rounded after 4th iteration)

47899109863
711141516171615116
814182021212119147
915202224252422168
916212631312925189
10172538534738302010
91935681107953362311
9214610625811763382311
7173568110774930188
49183244362516104

Temperature in field 7x3 after 135 iterations: