Hi all, I have a "cqr983", which i installed back in 2013 linked to the burglar alarm, just recently I have noticed the two leds on the detector are a steady orange rather than the normal steady green, I notice this detector does self diagnostic, could the detector be warning me that it has detected some co build up?, it hasn't gone off or made any noise, I would certainly know as it would trip the burglar alarm which is painfully loud, or is it likely the detector is warning me it needs replacing?