As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GOT GEAR DISAGREE WARNING MESSAGE WHEN LOWERING THE GEAR. LEFT MAIN SHOWED RED. APPROX 30 SECONDS LATER, MESSAGE CLEARED WITH A GREEN INDICATION ON THE LEFT MAIN GEAR. (FLT#3521) REMOVED AND REPLACED SYSTEM 3 HYDRAULIC RESERVOIR, NLG PRIORITY VALVE AND RESISTOR. OPS AND LEAK CHECKED GOOD.