That’s why you should always buy your pre-Renaissance MPCs from MPCStuff.com . . .
They refurbish them and let you know if it has good pads or if they need a refurb.
FYI, for the MPC-1000, as serial numbers go:
Blue always equals bad pads unless they’re specifically stated to have been refurbished.
Black ones with serial numbers including BK may or may not have bad pads and one with serial numbers that have BK-N have good pads.