What was found
IAD/RIC - FLT 7245 - DURING TAKEOFF, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO LT ENGINE HAD A DUCT FAIL WARNING LIGHT AND ONLY MADE 93 PERCENT TORQUE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED DUCT O-RING AND ADJUSTED LT ENGINE MAX POWER, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. REF: OPERATOR CNTRL NR VTZA990209.