Thanks for the quick reply Daniel. The two broken ones are both out of warranty. Never been dropped. I am a mechanic and use them quite a bit. All are in good visual condition. Both simply stopped working after a few years of use. I did see some sell the broken ones on eBay. So I wonder if:
1. Someone knows how to fix them.
2. People need them for the plastic cases.
Again, I am hoping someone knows how to fix them, or these will end up on eBay as well.