Go into single lamp test in the diags menu and test each lamp. Ghosting is when one light is fully on but another is half on or partially lit. If that's the symptom then the cointaker premiums will solve it.

But if the light is fully lit not partially lit, you have a diode problem. In this case either a lamp is wired wrong, a diode is bent shorting to the lamp base, etc. You'll have to track which socket it is and fix it. As you step through single lamp test and compare to the lamp matrix chart in your manual, a pattern should emerge like when lamp 11 is lit so is 21, 31, 81. When 12 is lit, so is 22, 32, 82 etc. Good luck.

Newpinowner: the issue I was describing can be only symptomatic with LEDs installed. I'm not an electrical engineer so I can't explain why. But each time I've experienced it was only after installing LEDs.

That video shows how to test them starting around 2:15 in. Remember that bad diodes can act as shorted diodes.