My 300TD has developed a leak at the bottom of the rear side window trim at the very back. I can reach up in the spare tire well and feel some flaking rust in the area. It doesn't feel like the drip rail trim area and the rust doesn't go all the way up to the window. It is maybe 3/4 inch wide and 1 inch long rusty area. How do I remove the bottom chrome trim piece in order to repair the rust. It's only maybe an inch long rust area but I want to get to it before it gets worse. Also is this a Bondo type repair or do I need to cut and weld in some metal?
Thanks
John

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1985 300TDT
2013 E350 Bluetec