The 210EXT appears to have surface mount components, according to pictures people have posted of the insides. It does come from a different factory than most of the other Everlast machines. Likely other machines made by that same factory would also use surface mount components.

Most of the other Everlast machines (including the older IGBT machines like the 250EX, 225LX, 200DX, and the older no longer available Mosfet machines like my Super200P) use through-mount components, which are definitely serviceable (if you have enough comfort with electronics to be able to diagnose the problem.)

FWIW, I've been pleasantly surprised at how available replacement circuit boards are for my old Super200P. Everlast supports their machines very well. I suspect replacement boards will probably be available for the the newer machines at a reasonable price. Everlast support is helpful in diagnosing problems and helping obtain replacement parts as needed, although schematics aren't generally available.