Just ignore it... its just the 1p LED bulb in a Hub3 fading over time from white to beige to yellow to orange to amber.
Only time for concern is if it goes bright Red to signify potential overheating.
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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.