Both TST and Tank 5 emptied overnight. Suspect emptied by 1am as the toilet did not flush. Both tanks were fill yesterday at approx noon. TST fill pump burn't out. Replaced with a spare bilge pump found in GreenHab. TST float sensor confirmed to be operating.

Currently filling TST from Tank 4. # flushes: Sunday 7, Monday 2 (manually added water).

Appears that system is not being filled with water from bilge. Unable to locate bilge pump switch, although did find various wires going into bilge area but not connected to anything. Currently filling TST from Tank 4 (7 flushes Sunday, 2 this am). At present fill rate (zero) do not expect water in tank 4 to last more than a day or two.