As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FLT 5195 - THE LEFT ENGINE FIRE DETECT LIGHT CAME ON. AIRCREW DID NOT SEE ANY FIRE. NO IN FLIGHT EMERGENCY WAS DECLARED. AIRCRAFT RETURNED TO CLT AND LANDED WITH NO OTHER PROBLEMS. MAINTENANCE FOUND THE LEFT ENGINE FIRE DETECT CONTROLUNIT BAD. REMOVED AND REPLACED CONTROLLER. SYSTEM OPS CHECKED GOOD. (M)