Toilet Troubles

September 27th (Friday) We awoke to a beautiful morning of almost clear blue sky. There were a few pinkish clouds clustered around some of the mountains and in the valleys, but the rest of the sky was clear. It was 8 degrees in our cockpit, the coldest yet. When I flushed our toilet in the back of the boat in the morning I heard a very odd crack-like sound. The plunger got very hard to pump and I could not suck any more water in, although I was still able to pump water out. Because of this happening I thought about preventative maintenance and about how our forward toilet was getting stiffer to pump. I took a bit of cooking oil to flush down it as it helps to keep the pump part lubricated. When I started flushing the forward toilet I got a couple of pumps through, and then it started to leak at the upper seal. I was also unable to switch it to empty the bowl. What are the odds of both of our toilets stopping to work within the same 10 minutes. I felt like I must be cursed. Si...