I think 163F is safe zone.
The maximum temperature of PB 2400 in good thermal condition is 160 -
180F.
As far as I know, 210F is a borderline of a thermal cutoff.
My page may help. -> http://grove.ufl.edu/~tkishino/PB2400/
The key of the thermal radiation from CPU is the "touch" between the CPU
die and the heatsink.
So, I guess, the die had not touched the heatsink well before DTT fixed
it.
DTT guys might raise the heatsink little bit to have it touch the die
completely when they tightened the CPU card up.
I know Japanese repair shops usually do this when they repair 2400.
doggyfox
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