(1) You can’t really measure resistors in circuit; at best it’ll tell you if the resistance is too high, but if you read a low value it’s just being affected by the rest of the circuit.
(2) Unsoldering suggestions, following this post:
(3) Repairing a damaged pad is generally difficult to practically impossible. Best thing usually is to just solder a small wire from the component to whatever it’s supposed to connect to. Which may not be obvious, but you can get it off the schematic.