As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON SELECTING GEAR DOWN, RECEIVED AN AMBER GEAR DISAGREE L, AND THE GEAR INDICATION SHOWED A BLACK BOX WITH AN AMBER X. THE QRH WAS COMPLETED, TO INCLUDE BLOWING THE GEAR DOWN AND PULLING THE UPLOCK HANDLE IN THE LAV. THERE WAS NO CHANGE IN THE LEFT GEAR INDICATION. R & R LT MLG UPLOCK SWITCH. ADJUSTED SWITCH TO PROPER MEASUREMENT WITH ACFT ON GROUND. OPS CHECKED GOOD. ALL DONE IAW AMM 32-00-00. NO DEFECTS NOTED.