I took a Lenovo X1 Carbon to Microcad for warranty...

I took a Lenovo X1 Carbon to Microcad for warranty service when the laptop started having trouble booting up and would blast a series of shrill beeps. The tech explained that he'd need to replace my Linux system with Windows so that he could run their diagnostics tools, which meant I lost everything on the hard drive (of course, everything important was already backed up). I was charged about $20 for service. After about a week, I got the call that nothing was found to be wrong with the system and I could pick it up. Unfortunately, the beep error code didn't go away and eventually the system failed to start up at all. When I called MicroCad about this, the tech refused to take it in, citing my Linux installation as the problem. I ended up taking the laptop to another Lenovo service center outside of town, where their tech ran a phone app to diagnose the beep code as a faulty logic board, took my laptop in for a hardware replacement, and returned a fully functional laptop at no charge.

In sum, I'm pretty unhappy with how things turned out with MicroCad. The employees were nice and I enjoyed interacting with them, but I'm pretty frustrated at the unnecessary time, expense, and their scapegoating my choice of OS.

EDIT: just checked my receipt - turns out I was charged over $50, not $20.