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Check several spots on the bird. Breast 165 done (i'd probe at leas 3 spots), deepest in the thigh over 165-170 done. If they are all over it's safe to eat. Higher in the leg/thigh is more palatable but still safe.3hrs isn't out of sight depending on the temp you ran.
Something sure isn't right. The MES max temp is 275 and there is no way a 15 pound bird can cook to 160 in three hours at that temp. I'd expect at least double that time.
First, check how hot your MES is getting.
Second, try an instant read thermometer (if you have one) to double check your probe.
Third, re-insert the probe somewhere else. If you hit a bone or if you have it inserted too far or too shallow, it will read incorrectly. The point of the probe should be as near to the center of the breast as you can get it.
Finally, do the old-fashioned test by wiggling the legs and wings. They should be really loose and the meat should be pulling away from the bone a little bit. Your bird has a beautiful color, but the drumsticks don't appear to have shrunk much.
Check your probes in boiling water! May be a bad probe?? Also, I'd use one probe to keep track of your chamber temp... My MES is off by as much as 20*. I never go by what the MES says, I go by my probe for chamber temp!