Changing the Jabsco toilet seals
The Jabsco toilet in the head was due to a seal change. I bought a replacement seal kit, which is not cheap, but still a quarter of the price of a new toilet. It contains all the seals in the unit and a new handle locking knob, which is useful as the old started to wear out.
Despite being not pleasant in nature, the job itself is fairly simple. A few screws and the pump assembly can be removed and taken apart completely. I gave it a clean and reassembled the unit with all the new seals.
Pump removed with a new seal in place
Unscrewing the locking knob
New upper gasket installed