As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, GEAR LEVER WOULD NOT GO PAST NEUTRAL POSITION, RETURNED TO ORD. *S/D* THE A-1 AND A-2 LANDING GEAR POSITION INDICATING SYSTEM PROXIMITY CARDS IN THE LANDING GEAR ACCESSORY UNIT WERE FOUND BAD. REPLACED CARDS, SYSTEM CHECKS OK.