A -64 is a controller safety check and cannot be bypassed.
if it is truly gone(possibly due to cleaning those terminals)
and now -57 is present then sometimes this can be dodged (as a test only by jumping the two big terminals on the relay. hook onto it with a big set of jumper cables when Key is on and see if the -57 clears.
press the pedal slightly to see if -
any other codes pop up
the -64 returns
or the car moves
This is test to see if you are chasing the correct tail.
If car moves - then go find another Main Contactor/relay.
I was waiting for Byron to confirm. But yes, if you measure voltage on one side of coil and none on other side, then coil is open and needs to be replaced with a 72v contactor.