1990 300 Windshield arm cover removal?

The windshield wiper on my 1990 300 CE has ceased to articulate when it sweeps the windshield. It was suggested that I may be able to remove the oval (more-or-less) cover in order to clean/lubricate and repair it.
However, how to remove it is not obvious to me.
With a small mirror I can see small holes on either side of the underneath of the assembly, but how to release the cover (if possible), is not apparent.
Any help appreciated.
Thanks,
C.A.
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That oval cover is snapped on I believe... sometime they may have a scew but is obvious if you have it.
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