What was found
(CAN) AIRCRAFT EXPERIENCED NR 1 PROPELLER TO FEATHER PITCH JUST AFTER TAKEOFF POWER WAS SET ON. PIREP RATING POWER SET, NR 1 ENG TORQUE INDICATION IN TURNED RED AND PROPELLER RPM DECREASED TO 200RPM. CONDITION LEVER MOVED TO START/FEATHER THEN BACK TO MAX BUT NO HELP. TAKE OFF REJECTED. NR 1 PROP REMAINED FEATHERED DURING TAXI TO GATE. PP FAULTS CHECKED, NO FAULTS. EMU DOWNLOAD, NO PP EXCEEDENCE RECORDED. ENGINE RUN-UP CHECKS, COULD NOT DUPLICATE. CLEANED FADEC, PEC AND PCU CONNECTORS. REPLACED NR 1 PCU FOR TROUBLESHOOTING. AIRCRAFT RTS.