I just ordered a replacement switch. It has an LED light with another non marked (Step Cover) cap. I have been told the cap is replaceable. We will see. I also found where I can purchase replacement LED lights. After I receive my new switch, verify that I am getting what I expect, then I will take apart my old switch and verify the side of LED needed. My next step is to purchase some LED's and replace the current incandescent bulb.
If all go's well (and even if it doesn't), I will report back my findings.