Installing Schwinn Vestige frame LED cable I read a post (Daniel and Jennifer) from a couple of years ago explaining that the Vestige frame LED should be replaced if it is no longer working.  Thanks for that. Now, I'm seeking tips, a guide or a manual on how to install the new light string so it will work properly.  Mine is not. Dynamo has been tested and works fine.

I do a lot of bike repairs but this one is a big challenge.
I would start by pulling the seatpost, fork and the bottom bracket. Use a small mirror similar to a Dentists type to try to see if the wire is attached in the frame or just passes thru. You may then be able to remove it. If possible attach a string to the end of the cable. You can then use the string to pull the repaired light cable back through the frame.