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SBT150 is a shottky dual-diode,100V 15A. Around .2V across the junctions is right.
As for the FQD16n25c, the extra digit should work OK. I find it is usually a change in mounting style, as you said. There may be a series resistor/capacitor, or diode across the mosfets that died and is not snubbing a pulse that needs snubbing.
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