I got the secondary issue resolved. I cleaned the terminals on the light bulb. Now it works again. Hooray. Now to wait for new parts to get here so I can install them. I don't know which 12v fuse is for the HWH, so I will just pull the main power CB. That should cover it. Just to avoid confusion, the 12v/gas side has been working. I wanted to be able to use the 120v element to save a bit of gas. I had an idea that the element was bad. The PO didn't seem to want to fix anything correctly. If he couldn't glue it back together, it stayed out of service.