As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSP - CREW REPORTED A BURNING PLASTIC SMELL IN CABIN DURING CLIMBOUT. AFTER REACHING CRUISE SMELL DISSIPATED THEN ON DESCENT THE ODOR RETURNED. EMERGENCY DECLARED LANDED MSP WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT PACK PRESSURE REGULATING SHUT-OFF VALVE AND ACCOMPLISHED PACK BURN. SYSTEM GROUND CHECK NORMAL OPERATION.