Sean,

I have been out for a while, and not able to work on this problem (just been using a floater and 3" tabs to get by). But, I am back on it now. Thanks for your help and patience.

First, the good news: the Purifier Off message has gone away so I am back to the simple problem of low amps. The "Test" menu still shows 0v @ .5A.

As I reported before, the fuse shows continuity. Inspection of the board does not show any of the signs you told me to look for.

This leaves me wondering what to do. I don't want to invest in a new cell, only to find out I have a board problem that needs major repairs. Can you ballpark what the cost of a replacement board will be?