Red light on macerator control (Dometic)

[Neal]

2017 Newmar Ventana. At times I've had the yellow light come on which is typically resolved by some tank cleaning, cascade, etc. Coach has been in storage for longer than I care to think about or share but yesterday I brought it home and prepping for departure tomorrow for a few weeks out. Front tank display shows 1/3rd on black tank level, gravity toilet flushes with no issues or tank sensor blocks. I put some cleaner and water in that will slosh around for tomorrow's travel day and we'll see how it looks when I arrive. Maybe a 12V cycle is in order for first triage. I'm not sitting level right now as it's on an uphill road but it's odd that the tank sensor is reporting 1/3rd yet the macerator control is showing a red light.

I welcome any suggestions for my usual trip start triage fun.