As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED GEAR DISAGREE MASTER WARNING. RAN QRH. GEAR SHOWED THREE DOWN AND LOCKED AFTER FIRST CYCLE OF GEAR. RETURNED TO LAND WITH NO OTHER ISSUES. THE INITIAL GEAR THAT DIDN'T EXTEND WAS THE LT MAIN. REPLACED NR 3 HYD RESERVOIR DUE TO A LEAKING WEEP HOLE ON AFT SIDE OF RESERVOIR.