What was found
EN ROUTE BETWEEN ELP AND TOL IN CRUISE FLIGHT AT FL 37, THE MAIN CARGO COMPARTMENT SMOKE DETECTOR LIGHT ILLUMINATED. ATC WAS ADVISED, AND THE AIRCRAFT DIVERTED TO OKC. ON THE GROUND IN OKC, AND AIRCRAFT WAS CHECKED FOR SIGNS OF FIRE, SMOKE, OR ODORS OF COMBUSITON. NONE WERE FOUND IN THE MAIN CARGO COMPARTMENT OR THE BELLY COMPARTMENTS. TROUBLESHOOTING OF THE SMOKE DETECTOR SYSTEM REVEALED A SMOKE DETECTOR CONTROL AMPLIFIER WHICH INTERMITTENTLY PRODUCES A FALSE WARNING LIGHT ON THE GROUND. THE AMPLIFIER WAS REPLACED, AND THE AIRCRAFT RETURNED TO SERVICE. (M)