What was found
RDD FLIGHT NR 2310, BOTH CONDITION LEVERS INADVERTANTLY BROUGHT BELOW MINIMUM RESULTING IN NR 1 AND NR 2 PEC CAUTION LIGHTS AND PROP RPM 1060-1070. MAINTENANCE C/W Q400 FIM TASK 61-20-05-810-822. RESET SET FAULT CODES. C/W AUTO FEATHER TEST. NO DEFECTS NOTED. PERFORMED OPS TEST OF OVERSPEED GOVERNOR TEST IAW Q400 AMM TASK 61-20-00-710-801. NO DEFECTS NOTED. OPS TESTED GOOD. COMPLIED WITH FIM TASK 61-20--06-810-818. NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.