The title is referring to the CO2 monitor which we shoved down the exhaust of Prion’s webasto heater. The exhaust kept on belching out black smoke and then catching alight when we tried to use it. After talking to the Webasto technical advice team Matt and I testing the exhaust as they requested however, it came up as unreadable do to the pure amount of soot. Matt cleaned out the exhaust hoses on both boats while I replaced all the reverse steering cylinder hydraulic oil on the jet units of Pipit. The oil had taken in some moisture so it was mayonnaise consistency. The port one was an easy job and the system bled of air quickly however the starboard one required a little more persuasion. So we had a Friday of getting the boats ready for a weekend of boating.