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SI diodes don't normally wear out, this does not mean they can't be damaged or stressed, but if used within specs, they tend to last forever, unlike selenium.
I just find VERY unusual that you can't set your DVM from AC/DC amp measurement modes, if this indeed true, it casts doubt on everything it's telling you, and I do wonder what the heck type that is, cause in all my many years of tech repair, I have never seen that before.
And, it's highly recommended that you get another DVM, like the one I suggested, or any other low to mid range one, and use it as a 2nd opinion.
Don't rely on just the one, especially if it WON'T let you put it into DC amp mode.
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