Yep the real challenge is understanding when it’s fucked vs when it’s slightly off kilter and a professional can give it a stern look and fix it, but with most things these days it’s always a “well, we can get you a new module, but it’s on back order; it’ll take 6 weeks to come in, maybe buy a new widget”.

In lieu of nothing, there’s UV lights for drinking water that might fit the need that are reasonably reliable… or maybe just a binge of bigclive opening things up might give the key for cracking that UV light. good luck!