As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS ELECTRICAL BURNT SMELL IN REAR CABIN WHEN AIR CONDITIONING TURN ON. REPLACED 2 EACH WIRE CONNECTORS ON AIR CONDITIONER COMPRESSOR RELAY P/N RC10-250F IN ACCORDANCE WITH SERIES ELECTRICAL SYSTEM INSTALLATION DWG. NO. 206EC-856 AND BHT-ELEC-SPM CHAPTER 4. OPERATIONAL CHECK GOOD.