As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. LAX-ORD FLIGHT RETURNED TO LAX ACCOUNT LANDING GEAR WOULD NOT RETRACT. OVERWEIGHT LANDING UNEVENTFUL. REPEAT ITEM. REMOVED AND REPLACED THE LANDING GEAR LEVER MODULE PER AMM 32-31-11 (AALA20170822007) AND THE PROXIMITY SWITCH ELECTRONICS UNIT PER AMM 32-09-10. OPERATIONAL CHECK GOOD.