As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF RECEIVED GEAR DISAGREE ON LEFT MAIN, SHOWED RED BOX. COMPLIED WITH QRH, DIVERTED AND PROCEEDED WITH NORMAL LANDING, NO FURTHER INDICATIONS. (FLT#3765) FO: 09/06/2019 CLOSED REMOVED AND REPLACED RT MLG OUTER DOOR CLOSING STRUT ASSY IAW AMM. OPS CHECKS GOOD NO DEFECTS NOTED AT THIS TIME.