I see no response to you so far......so bumping you back to the top since I can't help much. I have looked at my 2013 ACE headlights over the years and pray that no random rock takes either one out of action.....they look like a major PIA to remove (never mind cost to buy). I have also looked around for any videos on occasion (just in case) and it seems like RV headlight removal/repair videos are an extinct species......unless something has changed. Maybe someone else has found the elusive generic (but detailed) video for us both.
Not sure about a video on replacement. I saw a couple, but they were not specific to the 90mm. IThe light comes as a whole assy. and you can find the link for ebay which was the best price I could find.
IIRC, it was not an easy light to access on my Vegas.
HighPlainsThor.....here's your opportunity to become a videographer and make a detailed video of how you single handedly repaired your headlights in glorious detail for us to see if it can be applied to our coaches when required........or not. If I ever had to do the headlights on my coach, most of the audio would need to be bleeped out I am afraid.