2000 Acura TL Pas. side low beam headlight flicker

The passenger side low beam headlight on my dad’s 2000 Acura TL is flickering. I’ve read some things about HID lights and I would like to fix it myself with some help from our forum. One thing is that I’ve noticed several warnings about voltage being left in the system when it is off. Is there a recommended way to fully discharge this voltage? My first thought, as far as trying to fix the problem is to switch the bulbs from one side to the other to see if the flickering also moves. Any suggestions, reference materials, etc? I’d rather not take it to the dealership because some of the online postings indicate that this can be an expensive proposition! Thanks for any help you can give me. I have some mechanical and electrical knowledge, but HID systems are new to me!