As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
7158-STL- DURING DESCENT LANDING GEAR WOULD NOT EXTEND NORMALLY, NO CIRCUIT BREAKERS WERE POPPED AND HAD TO EMERGENCY EXTEND THE LANDING GEAR. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR SELECTOR VALVE IAW ATR42 MAINTENANCE MANUAL.