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I had the same problem on the front signal lenses our "88 745 GLE. I was worried because our '90 745 GL lost a lens after a rock cracked it, I think that air pressure inside the lens blew it off.
Because I make plastic models, I painted the lens with Testor's plastic model glue, a clear liquid that is thin enough to seep into the cracks. It comes in a small bottle with a brush like a nail polish brush. Some say that it is merely acetone (nail polish remover).
This method made about 80% 0f the cracks disappear and made the lens look clearer and smoother on the surface. I think that this is the process used in TV ads for a liquid to repair scratched plastic eyeglasses.
Personally, I use a small paintbrush because the brush picks up some of the plastic that it is used on. I clean the brush with more glue brushed out on a clean paper towel
WARNING - Give the lens a generous coat by working decisively and quickly.
DO NOT re-brush areas that you have painted as the plastic has been melted, and brushing will cause blemishes.
Try a small area before going whole hog.
Leave the lens alone for quite a while to allow the solvent to dry.
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'96 855R,'64 PV544 driver, '67 P1800 basket case, '95 855, '95 854, the first three are mine, heh, heh, 415,000 miles put on 9 bricks
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