As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WILL NOT RETRACT. CHECKED EMERGENCY VALVE PIP PIN. ALL CIRCUIT BREAKERS ARE IN. TRIED GEAR OVERRIDE, STILL COULD NOT GET GEAR TO RETRACT. HYDRAULIC PRESSURE CHECKS IN GREEN. FOUND LANDING GEAR OVERRIDE BUTTON IMMOBILE DUE TO INSTALLATION OF INCORRECT SCREW STYLE IN BOTTOM MOUNT HOLE FOR LANDING GEAR SELECTOR HANDLE ASSEMBLY. INSTALLED SHORTER SCREW IN BOTTOM MOUNT HOLE. ALL LANDING GEAR OPERATES NORMALLY NOW.