I've read on forums that if you use a really thin, small metal device, e.g. a sewing needle for example, you'll be able to dig up tons of tiny lint and make the

I've read on forums that if you use a really thin, small metal device, e.g. a sewing needle for example, you'll be able to dig up tons of tiny lint and make the port work like new again. You say yours is free of debris but it's possible you used thicker tools, and didn't manage to dislodge it all.