As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GEARS RETRACTION TESTS FOR TASK 3230/09 ITEM 100, FOUND LT MAIN LANDING GEAR ALTERNATE DOWN LOCK INDICATION INDICATING "DOWN AND LOCKED " WHILE THE GEAR WAS STILL RETRACTED. MOST PROBABLE CAUSE, FAILURE OF LIGHT SENSITIVE DIODE IN CABLE ASSY. LT MLG ALTERNATE DOWN INDICATION CABLE REPLACED.