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PF500 dreaded Fault light on...

Yup, this has to do with manufacture of electronics across the board, not just class D amps. You trade user-serviceability and large physical size for disposability and small physical size

of course you're right. it's the nature of everything these days. cheapness and disposability: iow, "it's so damn cheap when it breaks just toss it and get another". i call it the behringer mentality. thing is, you get what you pay for. i can't get along with problems like the op is having when it comes to amps. those heads are not even two years old yet for crying out loud. there's seemingly many reported problems of catastrophic failure, and ampeg is playing warranty hardball with a product that's still basically a new model? very bad move on their part. i buy amps that are built with discrete parts, and that can be repaired easily. traditional tube and ss led sled designs do that for me, as i'm not into the idea of replacing modules that you have to jump thru all sorts of hoops to obtain. later for that silliness afaic
 
Of course it has nothing to do with SMPS or class D amps. It is all the SMT technology. Very few amp techs have the ability or gear to work on surface mount. Though more are making the investment. As more and more high end gear is built this way, the techs will gain the skills. But I have already been told by some very high dollar techs that they would rather not work on SMT at all. They will stick to repairing old gear, and not having to deal with SMT or ROHS.