What was found
AT 14000 FT WENT BELOW MIN/880 WITH CONDITION LEVERS. RETURNED CONDITION LEVER TO MIN 850 IMMEDIATELY. NR 1 AND NR 2 PEC FAILED AND PROPS WENT TO 1080 RPM ON FINAL APPROACH TO EWR AIRSPEED 180 ALT 3000 FT. NR 1 ENG CYCLES IN AND OUT OF FEATHER. MANUALLY FEATHERED NR 1 ENG AND SHUT NR 1 ENG DOWN WITH QRC. NORMAL LANDING. PULLED OFF RUNWAY AND SHUTDOWN NR 2 ENG PER NORMAL CHECKLIST. RETRIEVED DATA FROM THE EMU IAW Q400 AMM 45-00-73-742-801. FOUND FAULT CODES 280 AND 238 SET ON PROPELLER NR 1 AND NR 2. PERFORMED TROUBLESHOOTING IAW FIM TASK 61-20-06-810. OPS CHECK GOOD. NO FAULTS STORED.