As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT & AFTER GEAR SELECTION UP, THE GEAR STAYED DOWN WITH ALL THREE GEAR INDICATIONS DOWN. ASSOCIATED PARK BRAKE SOV & ANTI SKID CAUTION MESSAGES. RETURNED TO THE FIELD. REMOVED AND REPLACED LANDING GEAR CONTROL HANDLE IAW AMM. FUNCTIONAL TEST OF LANDING GEAR EXTENSION AND RETRACTION SYSTEM NORMAL IAW AMM.