OK I opened the box and took some photos.
Here's the best one:

https://skydrive.live.com/#cid=192A1...BAC76052E3!197

I did a couple of continuity tests.

I disconnected the leads to the alarm float.
My ohm-meter shows 100K across the leads to the alarm float.
Is this a reading for an OPEN switch or a CLOSED switch?

What other tests should I do to troubleshoot?
Thanks!