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 122°C heat to the field 8x6
What is the temperature (rounded to whole numbers) in the field 3x9 after 69 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
814182021212119158
9152022232424232112
9162123252628343923
10172124262837598545
91621242631479120573
8151921232840628846
6111416172127364124
367891113161710

Temperature in field 3x9 after 69 iterations: