How does one determine whether a waterlogged High HP pump is electrically OK to use?
Provided that the motor did not run while wet, then the windings are probably fine because they are encased in enamel. But if it's still wet inside, or dirty, or you have a seized bearing, then trying to run it could burn out the windings. At that point you're looking at replacing the stator or the whole motor.

So the question of whether to run it or not should be based on how much it would cost to replace vs. service. If replacing the motor/pump is less than having the motor serviced, then power it up.