As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT GEAR UNSAFE LIGHT INOP DURING RETRACTION AND EXTENTION. TESTED OK, RECYCLED GEAR AND PROBLEM REMAINED. REPLACED DOWNLOCK SWITCH ON LEFT GEAR. POSITION AND WARNING SYSTEM OPS CHECKED GOOD IAW DC-9 MM 32-60-00. PIN RETENTION POOR ON PINS 5 AND 7 OF PLUG P1-130. REPLACED PINS 5 AND 7 ON PLUG PER WDM 32-61-00, OPS CHECK WAS GOOD.