As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3407 - LEFT PROPELLER RPM CAME UP TO ONLY 1,250 RPM ON TAKEOFF. ALL OTHER PROP/ENGINE GAUGES WERE NORMAL. MAINTENANCE REMOVED AND REPLACED LEFT PROPELLER SENSOR IAW SAAB MM. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (X)