As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAUTION PANEL FIRE LIGHT ILLUMINATED DURING TAKEOFF, PILOT PERFORMED AN UNSCHEDULED LANDING, DISCOVERED THAT THE FIRE LIGHT PRESS TO TEST SWITCH WAS FOUND ENGAGED. TECH DISENGAGED FIRE LIGHT PRESS TO TEST SWITCH TO EXTINGUISH LIGHT. SWITCH FOUND TO BE IN SERVICABLE CONDITION AND SYS WAS FUNCTIONING AS REQUIRED.