As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STUDENT PILOT AND INSTRUCTOR NOTED SMOKE COMING FROM LANDING LIGHT SWITCH AREA. RETURNED TO BASE AND NOTIFIED MAINTENANCE. SWITCH FOUND U/S, CIRCUIT BREAKER HAD NOT POPPED. THIS HAS HAPPENED NUMEROUS TIMES BEFORE TO THIS TYPE OF SWITCH.