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 152°C heat to the field 8x6
What is the temperature (rounded to whole numbers) in the field 6x8 after 71 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
9152022232424242213
9162123252629374427
101721242629406710153
916212426325310825189
81519212329447310656
6111416182129414829
367891114192012

Temperature in field 6x8 after 71 iterations: