As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, THE FIRE LIGHT ILLUMINATED, PILOT PERFORMED AN UNSCHEDULED LANDING, MX WAS THEN CALLED OUT AND FOUND THAT THE 30 ALPHA PANEL FIRE TEST SWITCH WAS DEPRESSED. TECH CYCLED THE SWITCH AND PERFORMED FUNCTIONAL CHECK NO FURTHER ACTION WAS REQUIRED.