As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3307 - LEFT ENGINE HAD POPPING NOISE, ENGINE OVERTEMP AND IGNITION LIGHTS ILLUMINATED ON TAKEOFF ROLL. PAX REPORTED SEEING SPARKS FROM EXHAUST. PERFORMED ENGINE WASH AND BORESCOPE NO DEFECTS NOTE. PERFORMED OPERATIONAL CHECK OF APR SYSTEM AND ANTI-ICE START BLEED VALVE. NO DEFECTS NOTED. ENGINE RUNS AND OPS CHECKS WERE GOOD. ALL CHECKS PERFORMED IAW MM. AIRCRAFT RETURNED TO SERVICE. (M)