Ignore it (unless it turns red). Its just a sign of a fading/failing 1p LED in the Hub3's. You may have been issued with a "refurbished" Hub3 and so it may be quite "aged" already.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.