As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR UNSAFE LIGHT ILLUMINATED DURING GEAR RETRACTION ALONG WITH 3 GREEN INDICATION LIGHTS. THE RT AND LT MAIN GEAR THEN CAME BACK DOWN. THERE WAS A DROP IN THE HYD PRESS TO APPROX 1000 PSI, PLACING THE GEAR HANDLE IN THE DOWN POSITION THE UNSAFE LIGHT EXTINGISHED AND HAD A 3 GEAR DOWN AND LOCKED LIGHTS ILLUMINATED.