[wiredgeorge]

There is no lever on the outside of your water heater that I know of. Can you take a pic and post? The Dometic toilets have been known to have issues in several areas including the valve at the bottom/rear. Buy a new one and a spare. If the toilet sat during the winter and that valve had water, I believe they are designed to break instead of anything else. Can't help you with a flush ball as I have never seen nor heard of one cracking. Not sure I would mess with trying to change it. The Dometic 320 is more elongated than the 310 and fits a human better in many cases. I bought ours from pplmotorhomes.com parts department and had it in one day (I live about 4-5 hours from Houston). What lights on the slide are you referring to? Not knowing what type trailer or if they are 110V or 12V, can't offer much advice; we have both in our slide. Outside the Dometic brand of toilet there are Thetford and a couple lesser brands; some more expensive and perhaps higher quality. We got rid our Thetford Aquamagic as sitting on it didn't feel like magic.