As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) STRONG ELECTRICAL BURNING SMELL DETECTED AFTER TAKEOFF, CHANGED TO HOT SMELL THEN DISSIPATED. MAINTENANCE INVESTIGATION REVEALED NR 1 AIR CONDITIONING PACK HAD FAILED. NR 1 AIR CYCLING MACHINE WAS REPLACED. SYSTEM OPERATIONALLY CHECKED SERVICEABLE.