I have a ditch light that is out on my UP AC6000 6-28327. The Lionel part number for a replacement with harness/wires is 6208327387 LED/DITCH LIGHT /AC-6000 / LEGACY. Lionel shows they are unavailable. Anybody know where I can find one? The number on the back of the LED board is 28-A144. I have confirmed I have 5 VDC at the LED terminals.