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. SLC-ORD FLIGHT RETURNED TO SLC ACCOUNT LANDING GEAR WOULD NOT RETRACT. OVERWEIGHT LANDING UNEVENTFUL. ACCOMPLISHED GENERAL VISUAL INSPECTION. CLEANED PROXIMITY SWITCHES. CHECKED OPERATION OF LIMIT SWITCHES. VERIFIED OPERATION OF THE LANDING GEAR SELECTOR VALVE. CYCLED LANDING GEAR 4 TIMES. OPERATIONAL CHECK GOOD PER AMM 32-32-00.