TLR-1 HL - Strobe Mode Not Disabling

Currently have been troubleshooting an issue with a TLR-1 HL that I just picked up earlier today. The strobe mode is not disabling despite going through the steps outlined in the online manuals and tutorials. I did get this used, and it's got some holster wear on it.

I'm not sure how to proceed. Should I send it to Streamlight for warranty work? Should I replace the switch panel on the back? What are your thoughts?