mesa fifty fifty issues

[dxjxrose]

so i ordered a used 50/50 and it came is with 3 broken pots and when i was inside i noticed the 2 resistors in the pic are missing.... the amp seems to work fine minus the pots being broken... should i replace them or are they not needed? also are the 250k pots i need log or audio taper as the schem. doesnt say

 

[dxjxrose]

well i did some digging on this amp and who ever did the deep mod moved the heater reference to ground up on the heater rail on the power tubes so thats not an issue... so now i just need to know do i need log or audio taper pots?