On Mon, 19 Mar 2007 11:23:05 -0700, SparkyGuy
wrote:

The diodes test good one way so I wonder if either the BT137F triac or
the DB3 diac are the problem. Can these be tested with a VOM?

With that low part count, replace both. Sometimes "shotgun" troubleshooting
pays off compared to time spent testing.

After confirming that all the other components test good (cap, *switch*,
etc.)...

Thank you. That sounds like a good idea -- especially since I've
already removed the diac from the board.