As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CLIMBING GEAR DISAGREE MASTER WARNING APPEARED WITH NOSE INDICATOR SHOWING RED. RAN QRH, WHICH CLEARED THE PROBLEM, DECLARED EMERGENCY, DIVERTED. LANDING AND TAXI TO GATE NORMAL. (FLT 4564) FO: 07/30/2018 CLOSED. INTERROGATED PSEU. REMOVED AND REPLACED NOSE GEAR DOWNLOCK NR 2 HARNESS ASSY IAW AMM. REMOVED AND REPLACED HYD SYS NR 3 RESERVOIR AND 3A PUMP IAW AMM. PERFORMED MULTIPLE GEAR SWINGS. OPS CHECK GOOD.