I have an old super 70 pulled from an AS 400 . Thinking about swapping it back in to the neck position to replace the SD jazz I put in there. The problem: Resistance reads only 3.8 K, about half of what it should. It's a 4conductor : ground (bare) red, white and black. Ground and red measure 3.8 K on the multimeter and white and black also measure 3.8K. Do I have a pickup that perhaps has de-magnetized? Could it be repaired?