plastic part which mounts just below the trunk opening and has the trunk button mounted through it? It's an '85 300SE w126.

This is my first time not being able to comprehend the factory service manual. I followed the in instructions to the letter but I never found the 'release,' for the tag light. I don't believe the light release mechanism is the issue here, good folks.

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84 300SD
85 380SE
83 528e
95 318ic