As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 360 - RDU-IAD - THE LEFT GEAR UNSAFE LIGHT INDICATION CAME ON DURING GEAR RETRACTION. CYCLED GEAR AND THE LIGHT STAYED ON, SAFE INDICATION ON APPROACH AND LANDING. TROUBLESHOT SYSTEM AND PERFORMED OPS CHECK. REMOVED AND REPLACED PROXIMITY SWITCH CONTROL BOX. SYSTEM OPS CHECKS GOOD IAW DC-9 MM 32-30-0.