A few instructions after reset, the Port Mode registers are initialized (0 to configure a pin as an ouput, 1 for an input) :
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PM0=0xf7; PM1=0x93; PM2=0x40; PM3=0xf7; PM4=0xfc; PM6=0xfc; PM7=0x84; PM12=0xee; PM13=0xff; // PM14 not initialized here
P15-TOH0, P16-TOH1, P20 to P25, P27, P33, P40, P41, P70 to P73, P75, P120, and maybe P140
I will try to put the scope on them tomorrow; Being given that the partition signal should be steady during normal operation, if some pins are toggling, we can also remove them from the list...