As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT AFTER SELECTING GEAR DOWN, LANDING GEAR RELAY CIRCUIT BREAKER TRIPPED. RAN THROUGH CHECK LIST, MANUALLY EXTENDED GEAR, ALL INDICATIONS SHOWED GEAR WAS DOWN AND LANDED SAFELY. MAINTENANCE INSPECTED RETRACTION AND EXTENSION OF LANDING GEAR SYSTEM IAW MM 32-30-00. SYSTEM BELIEVED TO HAVE MOISTURE BUILD UP. BLED HYDRAULIC LINES FOR BOTH MAINS AND NOSE AND SERVICED IAW MM 32-30-00 PERFORMED SEVERAL GEAR SWINGS IAW 32-01 OPS AND LEAK CHECKED GOOD.