As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A** SUPPLEMENTAL SDR ** BURNING SMELL IN COCKPIT WITH JUST THE LEFT PACK OPERATING. SWITCHED TO THE RIGHT PACK (LEFT PACK OFF) - SMELL DISSIPATED. DEFERRED PER MEL 21-51-1 L/H PACK CNTRL NO. M 702700. PLACARD INSTALLED. NO DMP.OPERATED LEFT PACK WITH NO ODOR OR FAULTS PER MM 21-51-00 THIS CLEARS DEFERRAL M 702700.