As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RDU - INFLIGHT YUL-MIA CREW REPORTED LEFT PACK LIGHT ILLUMINATED DURING FLIGHT. EMERGENCY DECLARED FLIGHT DIVERTED RDU LANDED WITHOUT INCIDENT. PLACARD LEFT PACK AS INOPERATIVE PER MEL 21-1A. FLIGHT CONTINUED TO DESTINATION. REPLACED TEMPERATURE CONTROL VALVE AT LGA ON 02/29/2012. SYSTEM GROUND CHECK NORMAL OPERATION.