My replacement board arrived the other day, so I thought I would post a picture of the differences. I've circled the main points to check when purchasing one of these. Presuming you are the usual 3 railer around here, meaning AC environment, look for the instructions to say "AC" on them. The paper should be white, not manila. The board itself should have a very prominent heat sink across 2 of the electrical chips. the other chip should be marked "AC".
Chris
LVHR