As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SMELL OF ELECTRICAL SMOKE. MX POWERED UP ALL SYSTEMS FOR 1.5 HOURS AND COULD NOT DUPLICATE. AIRCRAFT WAS RELEASED FOR SERVICE. NEXT DAY AFTER 7.3 HOURS OF FLIGHT TIME CREW REPORTED NO SMOKING CIRCUIT BREAKER POPPED. MX FOUND LOOSE WIRE AT CABIN NO SMOKING SIGN. NO REPORTS SINCE.