As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR IN CABIN DURING FLIGHT. MAINTENANCE DISCOVERED THAT DIODE THAT IS CONNECTED BETWEEN THE LANDING LIGHT AND TAXI LIGHT SWITCHES SHOWED SIGNS OF HEAT DAMAGE AND WAS VERY HOT TO THE TOUCH. REPLACEMENT OF THE DIODE REMEDIED THE PROBLEM.