I called WA last week about this very subject. If you are the original owner and you know that they haven’t been playing at high volume levels, or abused, there’s no need. If you are the second owner and have no idea, I would, I just bought a pair of mint Watt/puppy 7 and it was the first thing I did to them. Well, I waxed them with zymol first, then replaced the resistors, I sleep better at night knowing. - Robert
