As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LDG GEAR DISAGREE DURING EXTENSION. ALL THREE LANDING GEAR SHOWED UP AFTER GEAR WAS SELECTED DOWN. GEAR DID EXTEND ABOUT 10 SECONDS LATER ALL THREE GEAR SHOWED GREEN. HYD SYS 1,2 AND 3 SHOWED NORMAL INDICATIONS ON SYNOPTIC PAGE. (FLT#3880) CLOSED DEFERRED THE LANDING GEAR RETRACTION SYSTEM PER MEL.