But in doing so you have damaged the product outside of what could be considered normal wear and tear which, imho, would constitute voiding the warranty. Like if you tripped with scissors and cut a gash in the side of the hot tub, or dropped tea directly into the electrics. Thats human error, your fault. Not something the manuf should have to accept.
Indeed because at that point theres no warranty issue to worry about.
Ultimately I am less concerned about the warranty after the tub has been used a few times. As long as the core functionality is ok, i would probably never claim on the warranty anyway. But until its been confirmed not-DOA I will always leave devices fully intact, and keep all the packaging.