Great question — answering as the UphillTech team:
Based on the given information, it does not sound like the chicken was actually cooked as planned; maybe the oven's thermometer is off, or there is another problem. It sounds like raw meat juices (water and myoglobin, not blood, and I cannot remember the technical name for this fluid just now). If the oven was truly at 180 C (about 355 F), this would have evaporated or the heat would have destroyed the red color. Since the chicken was held at unknown temperatures for an extended period of time, I wouldn't risk eating it. I would recommend discarding this chicken immediately, and buy an oven thermometer immediately, to check its calibration, and if it is off, get it serviced.
Full answer by SAJ14SAJ: https://cooking.stackexchange.com/a/29459 (CC BY-SA 3.0).
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