You call about one dead speaker. Or a remote that’s stopped talking to the TV. You’re expecting a quick fix, and most of the time, that’s usually what it is. But every so often, that one small complaint is the first thread a technician pulls — and what unravels is an AV system that’s simply outdated, worn down, or no longer worth patching. Here’s what you want to keep in mind when the technician gets a clear view of your problem.