As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CIE - CREW REPORTED, LEFT MAIN GEAR 'A' AND 'B' SYSTEM RED LIGHTS REMAINED ILLUMINATED AFTER GEAR RETRACTION. THEY MADE AN AIR TURN BACK AND LANDED UNEVENTFULLY. MAINTENANCE ADJUSTED LEFT GEAR 'A' AND 'B' SYSTEM PROXIMITY SENSORS. OPS CHECK WAS GOOD. (M)