Marty,
Component is a Mosfet. Ive never been able to make out marvins guides to testing this kind of thing, so a check on a few others that are the same and then compare will tell you what the readings should be.
I doubt DSE will sell them, they hardly sell anything thats of any use component wise, but its worth a check.
20N10L or 22NE10L or IRL540 will do the job.
