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Hello, I can help. Let me review the specs on that fixture and get right back to you
Ok, pull down the plastic grille ring, not the glass. It will drop down about 2 inches and then you will find two wire springs on opposite sides holding it up. Unhook one set from the ceiling housing and you can change the bulb. Then re-install the spring holders into the housing and push the grille assembly back up to the ceiling. I've attached a couple of pics for reference.
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I know that is not the exact model you have with the plastic but yours should be the same concept
Here's a pic of an 8662 with the grille ring and lens removed