503 Series Flushmate pressurized tank replacement

Sharing in hopes this helps someone. VERY EASY DIY JOB.

We could hear dripping within the toilet. We thought it was the tank dripping into the lower part of the toilet - that maybe the flush cartridge was worn out and a small trickle of water was making it's was past it. Replacing the cartridge did not resolve the problem.

The problem turned out to be the flushmate tank itself. It was compromised somewhere. A small amount of water was escaping the pressurized tank and accumulating within the porcelain tank. There was about an inch of standing water within the porcelain tank. The dripping we heard was water escaping the pressurized tank and dripping into the standing water within the porcelain tank.