As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE UNSAFE GEAR LIGHT ILLUMINATED. THE CREW LOWERED THE GEAR & THE LIGHT EXTINGUISHED. AN EMER WAS DECLARED & THE FLIGHT RETURNED TO FIELD. FLIGHT LANDED WITHOUT FURTHER INCIDENT. THE ACFT WAS REMOVED FROM SERVICE. FOUND THE LOWER PISTON NOT EXTENDING FULLY. R & R LOWER PISTON IAW MCM 32-92-12. OPERATIONALLY & LEAK CHECKED GOOD. NOSE GEAR RETRACTS NORMAL, NO FAULTS NOTED.