>The parts in my 350W Ultra/Wintech with numbers starting with "LT" are
>dual Schottky diode packs and are mounted on the low voltage
>heatsink.

That sounds about right for mine... this one is like in the middle of the
low voltage side right infront of a transformer.. (there are a few mounted
next to each other further back, but those appear to be ok). The diagram on
the package looks like this: ---->|---|<---- (two diodies pointing toward
each other).

My biggest challenge is going to unsoldering the heatsink I think.. too
many components in the way to unscrew the part from the heatsink and remove
seperately..

Chris