As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT HAD UNSAFE INDICATION ON RT MLG. ACFT DID AN AIR RETURN AND LANDED SAFELY. TROUBLESHOOTING REVEALED RT LANDING GEAR DID NOT FULLY RETRACT. FURTHER INVESTIGATION FOUND THE MLG HYD MODULAR PACK LEAKING. R & R MODULAR PACK IAW THE AMM 32-32-61. OPS TEST CONFIRMED CORRECTION OF THE DEFECT.