Focus hunting problem in AF-S NIKKOR 28-70mm 1:2.8 D ED

This AF-S NIKKOR 28-70mm 1:2.8 D ED had problem with focus hunting, because of a dirty magnetic encoder tape in the focus system. It was "easy" to repair with a few drop's of Isopropylalcohol 99% on a cotton bud, one can also use "Eclipse" sensor cleaning fluid. TAKE CARE, NOT to touch the magnetic encoder take with a screw driver or other metallic tool's, it can destroy the info on the encoder tape