What was found
ACFT DEPARTED KISP EN-ROUTE TO KJPX, AFTER TAKE-OFF, THE CREW SELECTED GEAR UP, AND THE LANDING GEAR HANDLE WOULD NOT RELEASE. CREW DECIDED TO TURN BACK TO KISP FOR MAINTENANCE. CREW DID NOT DECLARE AN EMERGENCY AND LANDED THE AIRCRAFT WITH NO FURTHER DISCREPANCIES. ONCE AIRCRAFT WAS INDUCTED INTO MAINTENANCE, THE OMP INSPECTED THE GEAR, AND PLACED THE AIRCRAFT ON JACKS, NO PRESENT CAS MESSAGES, THE LANDING GEAR CIRCUIT BREAKER WAS RESET, AND NUMEROUS LANDING GEAR CYCLES WERE PERFORMED WITH NO DISCREPANCIES NOTED ON THE EQUIPMENT OR THE OPERATIONAL CHECKS. ITEM WAS CLOSED OUT AND AIRCRAFT WAS RETURNED TO SERVICE.