As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD SYS 3 INDICATED 20 PERCENT, SELECTED HANDLE DOWN, RECEIVED NOSE GEAR GROUND INDICATION, THEN RECEIVED MAIN DISAGREE MSG. PERFORMED LANDING GEAR MANUAL EXT EMERGENCY DECLARED AS A PRECAUTION. R & R 3A HYD PUMP IAW AMM 29-12-03. R & R NLG SELECTOR VALVE IAW AMM3 32-22-20 JACKED ACFT IAW AMM 07-12-01 PERFORMED GEAR SWING IAW AMM 32-30-00. LEAK AND OPS CK GOOD ACFT OK FOR SVC.