As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) STRONG SMELL OF BURNED PLASTIC WAS NOTICED IN THE COCKPIT. FURTHER INVESTIGATION REVEALED THAT THE LT BUS TIE TRANSFER SWITCH WAS CRACKED AND BURNED BY 1 OF THE WIRE ATTACH LUGS ON THE SWITCH. SWITCH REPLACED AND ACFT RELEASED TO SERVICE.