How do is fix noise with the Flasher Hazard relay

Absolutely! The clicking noise is still going "after" the hazard and turn signals are off. Make sense now?

My best guess would be a short in the button itself, not fully disengaging the relay.

Can you advise how to modify a EP29 Flash Relay device? I saw a sample on YouTube, but just curious to know.

Not without looking at the vehicle in person.