As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT HEARD A LOUD POP IN THE CABIN FOLLOWED BY AN ELECTRICAL BURNING ODOR, ALSO IN THE CABIN SHEDDING THE CABIN ELECTRICAL LOAD WITH THE INTERIOR MASTER TO THE OFF POSITION TOOK CARE OF THIS ISSUE INTERIOR MASTER WAS LEFT OFF. REMOVED AND REPLACED FWD AIR CYCLE MACHINE REF CE 750 MM 21-51-00. OPS CK AND CK OF FWD CKS GOOD AT THIS TIME REF CE-750 MM 21-51-00.