If it's the same as my 300CE, there should be one metric hex head screw that's holding it in place. Remove that screw (however big it is) and lift up on the OVP relay. It's a very simple thing to do that takes about 5-10 minutes each.

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Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....