As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2309 EN ROUTE TO ACV AT 21,000 MSL, IAS 250 KIAS, MAIN GEAR DOORS CYCLED OPEN AND CLOSED ONCE VERY QUICKLY. ADJUSTED LANDING GEAR DOOR CLOSE PROXIMITY SENSOR. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.